From Wikipedia, the free encyclopedia
Technology

Vital articles is a list of subjects for which Wikipedia should have corresponding high-quality articles. It serves as a centralized watchlist to track the status of Wikipedia's most essential articles. This is one of the sub-lists of the fifty thousand article Vital articles/Level 5 and is currently under construction.

Articles in the Vital list have their assessments labelled as:

  • Featured articles
  • Former featured articles
  • A-class articles
  • Good articles
  • Delisted good articles
  • Failed good article nominees
  • B-class articles
  • C-class articles
  • Start-class articles
  • Stub-class articles
  • List-class articles
  • Unassessed articles

The progress bar is auto-updated via category count, and the symbols and article counts are updated daily by User:cewbot. Please read the FAQ before modifying the article list.

Quota 3,200 articles.

Total 3,188 articles.

Class #Articles
FA 19
GA 77
A 2
B 680
C 1,507
LIST 9
FFA 56
DGA 76
FFAC 1
FGAN 84
Start 841
Stub 55
PR 148
ITN 37
OTD 4

General Information

This section contains 88 articles.

Creativity, Vocational education, Intellectual property and Patent are listed in the Society and Social Sciences section; Industrial design in the Arts section.
For history of technology, see History#History of science and technology section.

Engineering

This section contains 70 articles.

Basics

This section contains 18 articles.

  1. Engineering ( Level 2)
  2. Nanotechnology ( Level 4)
  3. Nuclear technology ( Level 4)
  4. Technical drawing ( Level 4)
  5. Engineering ethics
  6. Risk management
  7. Engineering management
  8. Engineering design process
    1. Requirements analysis
    2. Problem statement
    3. Feasibility study
    4. Engineering optimization
  9. Computer-aided design
  10. Engineering economics
  11. Engineering statistics
  12. Engineering research
  13. Reverse engineering
  14. Engineering studies

Disciplines

This section contains 52 articles.

  1. Agricultural engineering
  2. Applied mechanics
  3. Biological engineering
    1. Biochemical engineering
    2. Biomedical engineering ( Level 4)
    3. Pharmaceutical engineering
  4. Ceramic engineering
  5. Chemical engineering ( Level 4)
    1. Chemical reaction engineering
    2. Nuclear engineering
    3. Molecular engineering
    4. Petroleum engineering
    5. Process engineering
    6. Polymer engineering
    7. Plastics engineering
  6. Civil engineering ( Level 3)
    1. Architectural engineering ( Level 4)
    2. Construction engineering
    3. Earthquake engineering
    4. Environmental engineering
    5. Geotechnical engineering
      1. Directional drilling
    6. Hydraulic engineering
    7. Mining engineering
    8. Structural engineering
    9. Transportation engineering
    10. Highway engineering
  7. Electrical engineering ( Level 4)
    1. Computer engineering
  8. Energy engineering
    1. Power engineering
    2. Telecommunications engineering
    3. Electronic engineering
    4. Control engineering
    5. Microwave engineering
    6. Radio-frequency engineering
  9. Engineering physics
  10. Industrial engineering ( Level 4)
    1. Computer-aided engineering
    2. Manufacturing engineering
  11. Mechanical engineering ( Level 3)
    1. Aerospace engineering ( Level 4)
    2. Mechatronics
    3. Railway engineering
    4. Marine engineering
    5. Automotive engineering ( Level 4)
  12. Military engineering ( Level 4)
  13. Sanitary engineering
  14. Security engineering
  15. Software engineering ( Level 4)
  16. Structural analysis
  17. Systems engineering

Agriculture Information

This section contains 237 articles. See Agriculture in the Society category; also see History of Agriculture and related articles under History, or the Everyday life category for basic agricultural products

Basics

This section contains 11 articles.

Academic disciplines

This section contains 11 articles.

Forms

This section contains 55 articles.

Pest and disease control

This section contains 26 articles.

Buildings and infrastructure

This section contains 28 articles.

Animal husbandry

This section contains 21 articles.

Agronomy

This section contains 29 articles.

Horticulture

This section contains 22 articles.

Hunting and fishing

This section contains 18 articles.

Trees and forestry

This section contains 5 articles.

Agriculture, labor and economy

This section contains 8 articles.

Agriculture and ecology

This section contains 3 articles.

Agricultural machinery and tools

See "Agricultural tools" and "Farm and Garden Machinery" in Technology : Machinery and tools

Biotechnology Information

This section contains 45 articles. See also : Selective Breeding in Agriculture; Fermentation in Biology

Communication, media, and computing technology Information

This section contains 729 articles. For abstract topics in computer science, see Mathematics: Theoretical computer science ( Level 5)

Computing and information technology basics

This section contains 11 articles.

Computer science

This section contains 16 articles.

Computer architecture concepts

This section contains 27 articles.

Computer security

This section contains 40 articles.

Computer hardware

This section contains 80 articles.

Computer software

This section contains 39 articles.

Data storage and memory

This section contains 77 articles.

Networks

This section contains 70 articles.

Software development

This section contains 122 articles.

Software development: General

This section contains 64 articles.

  1. Software development
  2. Software prototyping
  3. Reusability
  4. Software portability
  5. Transparency (human–computer interaction)
  6. Library (computing)
  7. Formal specification
  8. Formal verification
  9. Software design
  10. Abstraction (computer science)
  11. Variable (computer science)
  12. Function (computer programming)
  13. Pointer (computer programming)
  14. Recursion (computer science)
  15. Iteration
  16. Computer programming ( Level 4)
  17. Flowchart
  18. Source code
  19. Bytecode
  20. Object code
  21. Executable
    1. .exe
  22. Parameter (computer programming)
  23. Collation
  24. Universal Product Code
  25. Character encoding ( Level 4)
    1. ASCII
    2. Mojibake
    3. Unicode
      1. UTF-8
  26. Error correction code
  27. Compiler ( Level 4)
  28. Interpreter (computing)
  29. Control flow
  30. Macro (computer science)
  31. Regular expression
  32. Calling convention
  33. Programming language ( Level 4)
  34. Programming paradigm ( Level 4)
    1. Functional programming ( Level 4)
    2. Structured programming ( Level 4)
    3. Modular programming
    4. Object-oriented programming ( Level 4)
    5. Declarative programming
    6. Imperative programming
    7. Logic programming
  35. API
    1. Carbon (API)
    2. Cocoa (API)
    3. Open Database Connectivity
    4. Windows API
      1. DirectX
        1. Direct3D
    5. OpenGL
    6. Vulkan
    7. Glide (API)
  36. Software testing
  37. Software bug
  38. Debugging
  39. Application checkpointing
  40. Exception handling
  41. Version control
  42. Software maintenance
  43. Software documentation

Programming languages

This section contains 41 articles.

  1. Syntax (programming languages)
  2. Metasyntax
  3. Backus–Naur form
  4. Type conversion
  5. Data type
  6. Delimiter
  7. Operator overloading
  8. Language binding
  9. Low-level programming language
    1. Machine code
    2. Assembly language ( Level 4)
  10. High-level programming language
    1. C (programming language) ( Level 4)
    2. C++
    3. C Sharp (programming language)
    4. Objective-C
    5. Delphi (software)
    6. Haskell
    7. Java (programming language) ( Level 4)
    8. Kotlin (programming language)
    9. Lisp (programming language)
    10. Lua (programming language)
    11. Scala (programming language)
    12. Swift (programming language)
    13. Visual Basic (.NET)
  11. Shading language
  12. R (programming language)

Data modeling languages

This section contains 1 article.

  1. SQL

Markup languages

This section contains 1 article.

  1. XML

Scripting languages

This section contains 6 articles.

  1. Python (programming language)
  2. Ruby (programming language)
  3. PHP
  4. Perl
  5. JavaScript ( Level 4)
  6. Shell script

"Historical" languages

This section contains 6 articles.

  1. ALGOL
  2. BASIC
  3. Pascal (programming language)
  4. Fortran
  5. Ada (programming language)
  6. COBOL

Artificial intelligence concepts

This section contains 17 articles.

  1. AI alignment
  2. Artificial general intelligence
  3. Neural network (machine learning)
  4. Computer chess
  5. Computer Go
  6. Existential risk from artificial general intelligence
  7. Generative artificial intelligence
  8. Large language model
  9. Machine learning
    1. Deep learning
  10. Natural language processing
    1. Speech recognition
    2. Machine translation
  11. Philosophy of artificial intelligence
  12. Technological singularity
  13. Turing test
  14. Weak artificial intelligence

Other media and communication technology

This section contains 101 articles. See also Arts: Literature; Society: Mass media
Physical and analog media are also included here

  1. Broadcasting ( Level 3)
  2. Communications satellite ( Level 4)
  3. Display device
    1. Cathode-ray tube ( Level 4)
    2. Flat-panel display ( Level 4)
      1. Liquid-crystal display ( Level 4)
      2. microLED
      3. OLED
      4. Plasma display
  4. Ebook
    1. E-reader
  5. Image ( Level 4)
  6. Image scanner ( Level 4)
  7. Mail ( Level 3)
    1. Courier ( Level 4)
    2. Postage stamp ( Level 4)
    3. Pigeon post
    4. Autopen
  8. Manuscript
    1. Scroll
  9. Portable media player
  10. Printing ( Level 3)
    1. Book ( Level 2)
      1. ISBN
    2. Photocopier ( Level 4)
    3. Printer (computing) ( Level 4)
    4. Printing press ( Level 4)
      1. Font
      2. Movable type
      3. Print on demand
  11. Radio ( Level 3)
    1. Amateur radio ( Level 4)
    2. Antenna tuner
    3. Radio broadcasting ( Level 4)
      1. FM broadcasting
      2. AM broadcasting
      3. Shortwave radio
    4. Radio receiver
      1. Crystal radio
      2. Superheterodyne receiver
      3. Transistor radio
    5. Software-defined radio
    6. Transmitter
    7. Walkie-talkie
  12. Smartwatch
  13. Sound recording and reproduction ( Level 4)
    1. Cassette tape
    2. Loudspeaker ( Level 4)
    3. Phonograph
      1. Phonograph record
    4. Headphones
    5. Microphone ( Level 4)
  14. Speech synthesis ( Level 4)
  15. Telecommunications ( Level 3)
    1. Demodulation
    2. Fax
    3. Modulation ( Level 4)
      1. Amplitude modulation
      2. Frequency-hopping spread spectrum
      3. Frequency modulation
      4. Frequency-shift keying
      5. Phase modulation
    4. Submarine communications cable
    5. Telegraphy ( Level 4)
      1. Electrical telegraph
      2. Flag semaphore
    6. Telephony
      1. Code-division multiple access
      2. Telephone ( Level 3)
      3. Landline
      4. Mobile phone ( Level 3)
      5. Satellite phone
      6. Smartphone ( Level 4)
    7. Text messaging ( Level 4)
    8. Videotelephony
  16. Television ( Level 3)
    1. Analog television
      1. NTSC
      2. PAL
      3. SECAM
    2. Color television
    3. Digital television
      1. ATSC standards
      2. Digital multimedia broadcasting
      3. Digital Terrestrial Multimedia Broadcast
      4. DVB
      5. ISDB
    4. High-definition television
    5. Ultra-high-definition television
    6. Mechanical television
    7. Cable television ( Level 4)
    8. Satellite television ( Level 4)
    9. Streaming media
    10. Streaming television
    11. Terrestrial television
  17. Typewriter ( Level 4)
    1. QWERTY
  18. Video ( Level 4)
    1. Video camera ( Level 4)
    2. Videocassette recorder
  19. Digital video recorder

Specific hardware

This section contains 34 articles.

Specific software

This section contains 60 articles.

Artificial Intelligence

This section contains 2 articles.

  1. AlphaGo
  2. ChatGPT

Browsers

This section contains 7 articles.

  1. Firefox
  2. Google Chrome
  3. History of the web browser
  4. Internet Explorer
  5. Microsoft Edge
  6. Opera (web browser)
  7. Safari (web browser)

Communication

This section contains 2 articles.

  1. Gmail
  2. Microsoft Outlook

Development

This section contains 2 articles.

  1. "Hello, World!" program
  2. Visual Studio

Multimedia

This section contains 9 articles.

  1. Adobe Creative Suite
    1. Adobe Flash
    2. Adobe Photoshop
  2. GarageBand
  3. GIMP
  4. Inkscape
  5. iTunes
  6. Microsoft Paint
  7. VLC media player

Office and data management

This section contains 11 articles.

  1. Adobe Acrobat
  2. Emacs
  3. LibreOffice
  4. Microsoft Office
    1. Microsoft Excel
    2. Microsoft PowerPoint
    3. Microsoft Word
  5. MySQL
  6. TeX
  7. WinRAR
  8. Vim (text editor)

Operating Systems

This section contains 19 articles.

  1. Android (operating system) ( Level 4)
  2. iOS ( Level 4)
  3. DOS
    1. MS-DOS ( Level 4)
  4. Mac operating systems ( Level 4)
    1. Classic Mac OS
    2. macOS
  5. Microsoft Windows ( Level 4)
    1. Windows 3.1
    2. Windows 9x
    3. Windows NT
      1. Windows XP
      2. Windows 7
      3. Windows 10
  6. Symbian
  7. Unix ( Level 4)
  8. Unix-like
    1. Linux ( Level 4)
      1. Debian

Science and Engineering

This section contains 2 articles.

  1. AutoCAD
  2. MATLAB

System

This section contains 3 articles.

  1. GDK
  2. KDE
  3. Wine (software)

Virtualization

This section contains 3 articles.

  1. Java virtual machine
  2. VirtualBox
  3. VMware

Specific websites and other computing services

This section contains 52 articles.

Cloud server

This section contains 2 articles.

  1. Amazon Web Services
  2. Google Cloud Platform

Multimedia

This section contains 5 articles.

  1. Flickr
  2. Netflix
  3. Pornhub
  4. Steam (service)
  5. YouTube ( Level 4)

E-commerce

This section contains 3 articles.

  1. Alipay
  2. Craigslist
  3. Taobao

Portals/Platform sites

This section contains 4 articles.

  1. Google ( Level 4)
  2. MSN
  3. Naver
  4. Yahoo!

Utility

This section contains 7 articles.

  1. GitHub
  2. Google Maps
  3. Internet Archive
  4. IMDb
  5. Rotten Tomatoes
  6. Urban Dictionary
  7. Wikipedia ( Level 4)

Science

This section contains 1 article.

  1. Berkeley Open Infrastructure for Network Computing

Search engines

This section contains 2 articles.

  1. Google Search
  2. Microsoft Bing

Social network and blogging

This section contains 28 articles.

  1. 2channel
  2. 4chan
  3. Blogger (service)
  4. DeviantArt
  5. Discord
  6. Facebook ( Level 4)
  7. ICQ
  8. Instagram
  9. Line (software)
  10. LinkedIn
  11. Myspace
  12. Pinterest
  13. Reddit
  14. Slack (software)
  15. Skype
  16. Snapchat
  17. Telegram (software)
  18. Tencent QQ
  19. TikTok
  20. Tinder (app)
  21. Tumblr
  22. Twitch (service)
  23. Twitter
  24. Weibo
  25. Vine (service)
  26. VK (service)
  27. WeChat
  28. WhatsApp

Electronics Information

This section contains 116 articles. For topics in electromagnetism, see Physics:Electromagnetism

Electronics: General

This section contains 9 articles.

  1. Electronics ( Level 3)
    1. Analogue electronics
    2. Digital electronics
  2. Circuit design ( Level 4)
    1. Electronic design automation
    2. Printed circuit board ( Level 4)
    3. SPICE
  3. Electronic circuit
    1. Multimeter

Components

This section contains 36 articles.

  1. Electronic component
  2. Amplifier ( Level 4)
    1. Operational amplifier
    2. Vacuum tube ( Level 4)
  3. Capacitor ( Level 4)
    1. Ceramic capacitor
    2. Electrolytic capacitor
    3. Film capacitor
    4. Leyden jar
    5. Supercapacitor
    6. Variable capacitor
  4. Diode ( Level 4)
    1. Light-emitting diode ( Level 4)
  5. Electrical connector ( Level 4)
  6. Inductor ( Level 4)
  7. Power supply ( Level 4)
    1. Current source
    2. Voltage source
  8. Resistor ( Level 4)
    1. Potentiometer
  9. Switch ( Level 4)
    1. Knife switch
    2. Relay ( Level 4)
    3. Rotary switch
  10. Transducer
    1. Actuator
      1. Solenoid
    2. Sensor ( Level 4)
      1. Avalanche photodiode
      2. Photodiode
      3. Photomultiplier tube
      4. Phototube
      5. Stretch sensor
      6. Thermistor
      7. Thermocouple
  11. Transformer ( Level 4)

Consumer electronics

This section contains 3 articles.

  1. Consumer electronics ( Level 4)
  2. AC adapter
  3. Remote control ( Level 4)

Digital logic

This section contains 16 articles.

  1. Asynchronous circuit
  2. Logic gate
    1. AND gate
    2. Digital buffer
    3. Inverter (logic gate)
    4. NAND gate
    5. NOR gate
    6. OR gate
    7. XOR gate
    8. XNOR gate
  3. Adder (electronics)
    1. Binary multiplier
    2. Subtractor
  4. Flip-flop (electronics)
  5. Synchronous circuit
    1. Clock domain crossing

Functional circuits

This section contains 14 articles.

  1. Bridge circuit
    1. Wheatstone bridge
  2. Electronic oscillator
    1. Clock generator
      1. Clock signal
    2. Crystal oscillator
    3. Variable-frequency oscillator
  3. Frequency mixer
  4. Gyrator
  5. Negative impedance converter
  6. Power inverter
  7. Rectifier
    1. Diode bridge
  8. Voltage regulator

Semiconductors

This section contains 14 articles.

  1. Semiconductor device ( Level 3)
  2. Integrated circuit ( Level 3)
    1. Application-specific integrated circuit
    2. Charge-coupled device ( Level 4)
    3. Field-programmable gate array
    4. System on a chip
      1. Network on a chip
    5. Very Large Scale Integration
  3. Transistor ( Level 4)
    1. Bipolar junction transistor
    2. Field-effect transistor
      1. MOSFET
    3. Transistor–transistor logic
    4. CMOS

Signal processing

This section contains 17 articles.

  1. Signal processing ( Level 4)
    1. Digital signal
  2. Analog-to-digital converter
  3. Digital-to-analog converter
  4. Filter (signal processing) ( Level 4)
    1. All-pass filter
      1. Lattice phase equaliser
    2. Band-pass filter
    3. Mechanical filter
    4. High-pass filter
    5. Low-pass filter
  5. Multiplexing
  6. Noise (electronics)
    1. Signal-to-noise ratio ( Level 4)
  7. Oscilloscope ( Level 4)
  8. Sampling (signal processing)
    1. Nyquist–Shannon sampling theorem

Signal transmission

This section contains 7 articles.

  1. Antenna (radio) ( Level 4)
    1. Antenna array
  2. Electromagnetic shielding
    1. Faraday cage
  3. Transmission line
    1. Coaxial cable
    2. Waveguide ( Level 4)

Energy Information

This section contains 170 articles.

Energy: General

This section contains 5 articles.

  1. Energy development
  2. Fire ( Level 2)
  3. Propellant
  4. Renewable energy ( Level 3)
  5. Sustainable energy

Fuel

This section contains 25 articles.

  1. Fuel ( Level 4)
  2. Biofuel ( Level 4)
    1. Biomass (energy)
    2. Charcoal ( Level 4)
  3. Fossil fuel ( Level 3)
    1. Coal ( Level 3)
    2. Coke (fuel)
    3. Fracking
    4. Natural gas ( Level 3)
      1. Liquefied natural gas
      2. Liquefied petroleum gas
    5. Oil well ( Level 4)
      1. Petroleum reservoir
      2. Oil platform
  4. Hydrogen economy
  5. Oil refinery ( Level 4)
    1. Aviation fuel
      1. Jet fuel
    2. Diesel fuel
    3. Fuel oil
    4. Gasoline ( Level 4)
    5. Kerosene ( Level 4)
    6. Liquid fuel
  6. Nuclear fuel
    1. Nuclear fuel cycle

Heating and cooling

This section contains 11 articles.

  1. Heating, ventilation, and air conditioning ( Level 4)
    1. Heat pump
  2. Air conditioning ( Level 4)
    1. Evaporative cooler
    2. Passive cooling
    3. Windcatcher
  3. Boiler
  4. Fan (machine)
  5. Heat exchanger
  6. Refrigeration ( Level 3)
    1. Yakhchāl

Lighting

This section contains 12 articles.

  1. Candle ( Level 4)
  2. Electric light ( Level 3)
    1. Flashlight
    2. Fluorescent lamp
    3. Incandescent light bulb ( Level 4)
    4. Neon lighting
  3. Gas lighting
    1. Gas mantle
  4. Lantern
  5. Oil lamp
  6. Prism lighting
    1. Light tube

Power generation

This section contains 40 articles.

  1. Power station ( Level 4)
    1. Electric generator ( Level 4)
      1. Induction generator
    2. Electricity generation ( Level 4)
  2. Hydropower ( Level 3)
    1. Hydroelectricity ( Level 4)
    2. Tidal power
    3. Watermill ( Level 4)
  3. Microgeneration
    1. Micro-CHP
  4. Nuclear power ( Level 3)
    1. Fusion power
      1. Inertial confinement fusion
      2. Tokamak
    2. Nuclear reactor
      1. Breeder reactor
      2. Molten-salt reactor
      3. Heavy water reactor
      4. Small modular reactor
      5. Nuclear marine propulsion
      6. Nuclear meltdown
  5. Solar energy ( Level 3)
    1. Solar power ( Level 4)
    2. Solar cell ( Level 4)
  6. Thermal power station
    1. Boiler (power generation)
    2. Cogeneration
    3. Combined cycle power plant
    4. Concentrated solar power
    5. Cooling tower ( Level 4)
    6. Fossil fuel power station
      1. Coal-fired power station
      2. Gas-fired power plant
    7. Geothermal power ( Level 4)
  7. Turbine ( Level 4)
    1. Gas turbine ( Level 4)
    2. Steam turbine ( Level 4)
    3. Wind turbine ( Level 4)
  8. Wind power ( Level 3)
    1. Windmill ( Level 4)

Power storage

This section contains 12 articles.

  1. Energy storage
  2. Electric battery ( Level 3)
    1. Lead–acid battery
    2. Nickel–iron battery
    3. Nickel–metal hydride battery
    4. Lithium-ion battery
    5. Lithium polymer battery
    6. Alkaline battery
    7. Atomic battery
  3. Fuel cell
  4. Pumped-storage hydroelectricity
  5. Solar fuel

Power transmission

This section contains 62 articles. See also: Electromagnetism and Electromagnetism

  1. AC power plugs and sockets
  2. Electric power transmission ( Level 4)
  3. Electric power distribution ( Level 4)
  4. Electrical grid ( Level 4)
    1. Three-phase electric power
    2. Virtual power plant
  5. Electrical wiring ( Level 4)
    1. Electrical cable ( Level 4)
  6. Mains electricity

Concepts

This section contains 23 articles.

  1. Availability factor
  2. Automatic generation control
  3. Backfeeding
  4. Base load
  5. Capacity factor
  6. Demand factor
  7. Droop speed control
  8. Energy demand management
  9. Energy return on investment
  10. Electrical fault
  11. Grid energy storage
  12. Grid code
  13. Home energy storage
  14. Load factor (electrical)
  15. Load-following power plant
  16. Merit order
  17. Nameplate capacity
  18. Peak demand
  19. Electric power quality
  20. Power-flow study
  21. Repowering
  22. Utility frequency
  23. Variable renewable energy

Electricity transmission and distribution

This section contains 20 articles.

  1. Demand response
  2. Distributed generation
  3. Distribution board
  4. Dynamic demand (electric power)
  5. Electrical busbar system
  6. Electric power system
  7. Interconnector
  8. High-voltage direct current
  9. Load management
    1. Electricity market
  10. Mains electricity by country
  11. Overhead power line
  12. Smart grid
  13. Electrical substation
  14. Super grid
  15. Transmission system operator
  16. Transmission tower
  17. Utility pole
    1. Overhead cable
  18. Wide area synchronous grid

Electrical protective devices

This section contains 10 articles.

  1. Arc-fault circuit interrupter
  2. Circuit breaker ( Level 4)
  3. Earth-leakage circuit breaker
  4. Fuse (electrical) ( Level 4)
  5. Lightning rod
  6. Residual-current device
  7. Power system protection
  8. Protective relay
  9. Numerical relay
  10. Sulfur hexafluoride circuit breaker

Specific energy structure

This section contains 3 articles. See "Dams" section in "Specific infrastructure" for hydroelectric power plants

  1. Synchronous grid of Continental Europe
  2. Eastern Interconnection
  3. Western Interconnection

Industry Information

This section contains 204 articles. See also: "Industry" in Business and economics ( Level 4)

Industry: General

This section contains 17 articles.

  1. Factory ( Level 4)
    1. Assembly line ( Level 4)
    2. Automation ( Level 4)
    3. Conveyor system
      1. Conveyor belt
    4. Industrial robot ( Level 4)
    5. Interchangeable parts ( Level 4)
    6. Mass production ( Level 4)
    7. Mechanization ( Level 4)
  2. Pelletizing
  3. Standardization ( Level 4)
  4. Waste ( Level 4)
    1. Incineration
    2. Landfill ( Level 4)
    3. Recycling ( Level 4)
    4. Waste management ( Level 4)
  5. 3D printing

Food, water and health

This section contains 28 articles.

  1. Air purifier
    1. Air filter
      1. HEPA
    2. Catalytic converter
    3. Respirator
      1. Gas mask
    4. Scrubber
  2. Bleach ( Level 4)
  3. Desalination ( Level 4)
  4. Detergent ( Level 4)
  5. Laundry ( Level 4)
  6. Food storage
    1. Pasteurization ( Level 4)
  7. Oxygen mask
  8. Sanitation ( Level 3)
    1. Sanitary sewer ( Level 4)
    2. Sewage treatment ( Level 4)
      1. Septic tank
    3. Water purification ( Level 4)
    4. Manhole
  9. Soap ( Level 4)
  10. Sterilization (microbiology)
  11. Water supply network ( Level 4)
    1. Aqueduct (water supply) ( Level 4)
    2. Qanat ( Level 4)
    3. Pumping station ( Level 4)
    4. Water tower ( Level 4)
    5. Well ( Level 4)

Materials

This section contains 40 articles.

  1. Abrasive ( Level 4)
  2. Ceramic ( Level 4)
    1. Pottery ( Level 3)
    2. Porcelain ( Level 4)
    3. Kiln
  3. Chemical vapor deposition
  4. Cork (material)
  5. Glass ( Level 3)
    1. Borosilicate glass
    2. Float glass
    3. Fused quartz
    4. Glassblowing
    5. Glass fiber
      1. Glass wool
    6. Safety glass
    7. Soda–lime glass
  6. Gutta-percha
  7. Leather ( Level 4)
    1. Artificial leather
    2. Hide (skin)
    3. Liming (leather processing)
    4. Parchment ( Level 4)
      1. Vellum
    5. Suede
    6. Tanning (leather)
  8. Mineral wool
  9. Natural rubber ( Level 3)
    1. Vulcanization
  10. Paper ( Level 3)
    1. Cardboard
    2. Papermaking
      1. Pulp (paper)
      2. Sizing
    3. Papyrus ( Level 4)
    4. Tissue paper
  11. Plastic ( Level 3)
    1. Carbon-fiber reinforced polymer
    2. Fiberglass
    3. Injection moulding
    4. Microplastics

Chemicals

This section contains 8 articles.

  1. Adhesive ( Level 4)
  2. Chemical plant ( Level 4)
  3. Composite material ( Level 4)
  4. Explosive ( Level 3)
    1. Dynamite ( Level 4)
    2. Fireworks ( Level 4)
  5. Lubricant
  6. Petrochemical ( Level 4)

Metallurgy

This section contains 48 articles.

  1. Metallurgy ( Level 3)
    1. Smelting ( Level 4)
      1. Blast furnace
      2. Crucible
      3. Electric arc furnace
      4. Induction furnace
  2. Extractive metallurgy
    1. Gold dredge
    2. Mineral processing
      1. Crusher
      2. Mechanical screening
      3. Spiral separator
      4. Stamp mill
      5. Trommel screen
    3. Rocker box
  3. Metalworking ( Level 4)
    1. Anvil
    2. Bellows
    3. Bending (metalworking)
    4. Metal casting
      1. Die casting ( Level 4)
      2. Lost-wax casting
      3. Sand casting
    5. Drawing (manufacturing)
      1. Wire ( Level 4)
    6. Electrical discharge machining
    7. Extrusion ( Level 4)
    8. Forge
    9. Forging ( Level 4)
      1. Power hammer
    10. Grinding (abrasive cutting)
    11. Heat treating ( Level 4)
    12. Laser cutting ( Level 4)
    13. Machining
    14. Metal fabrication
    15. Plating
      1. Anodizing
      2. Electroplating
      3. Powder coating
    16. Precipitation hardening
    17. Quenching
    18. Rolling (metalworking) ( Level 4)
    19. Sheet metal
    20. Sintering
    21. Soldering ( Level 4)
    22. Steelmaking ( Level 4)
    23. Welding ( Level 4)
    24. Work hardening

Textiles

This section contains 63 articles.

  1. Textile ( Level 3)
    1. Carding

Fabrics and fibers

This section contains 22 articles.

  1. Canvas ( Level 4)
  2. Carbon fibers
  3. Cotton ( Level 3)
    1. Chino cloth
    2. Denim
    3. Muslin
  4. Felt ( Level 4)
  5. Flannel
  6. Fiber ( Level 4)
  7. Jute ( Level 4)
  8. Kevlar
  9. Lace ( Level 4)
  10. Linen ( Level 4)
  11. Polyester ( Level 4)
  12. Rayon
  13. Silk ( Level 4)
  14. Spandex
  15. Thread (yarn) ( Level 4)
  16. Wool ( Level 4)
    1. Cashmere wool
    2. Tweed
  17. Yarn ( Level 4)

Other techniques

This section contains 12 articles.

  1. Basket weaving ( Level 4)
  2. Crochet ( Level 4)
  3. Dyeing ( Level 4)
    1. Dye ( Level 4)
  4. Embroidery ( Level 4)
  5. Knitting ( Level 4)
  6. Macramé ( Level 4)
  7. Textile printing
  8. Quilting ( Level 4)
    1. Quilt
  9. Sewing ( Level 4)
    1. Pattern

Spinning

This section contains 12 articles.

  1. Hand spinning ( Level 4)
    1. Distaff
    2. Spindle (textiles)
  2. Open-end spinning
  3. Spinning (polymers)
    1. Spinneret (polymers)
  4. Ring spinning
  5. Spinning frame
    1. Water frame
  6. Spinning jenny
  7. Spinning mule
  8. Spinning wheel

Weaving

This section contains 15 articles.

  1. Loom ( Level 4)
    1. Jacquard machine
    2. Pirn
    3. Power loom
    4. Shuttle (weaving)
      1. Flying shuttle
  2. Weaving ( Level 4)
    1. Brocade
    2. Damask
    3. Plain weave
    4. Satin
    5. Songket
    6. Tapestry ( Level 4)
    7. Twill
    8. Warp and weft

Infrastructure Information

This section contains 235 articles. See also Arts: Architecture

Basics

This section contains 2 articles.

  1. Building ( Level 4)
  2. Infrastructure ( Level 3)

Building materials

This section contains 42 articles.

  1. Brick ( Level 4)
    1. Fire brick
  2. Cement ( Level 4)
    1. Bitumen
    2. Portland cement
  3. Concrete ( Level 3)
    1. Asphalt concrete
    2. Concrete slab
    3. Precast concrete
    4. Prestressed concrete
    5. Ready-mix concrete
    6. Reinforced concrete
      1. Rebar
    7. Roman concrete
    8. Shotcrete
  4. Masonry ( Level 3)
    1. Brickwork
    2. Stonemasonry
  5. Quarry ( Level 4)
  6. Scaffolding ( Level 4)
  7. Adobe
  8. Construction aggregate
  9. Clapboard
  10. Mortar (masonry)
  11. Lath and plaster
    1. Lath
    2. Plaster
  12. Drywall
  13. Rammed earth
  14. Roof shingle
  15. Siding (construction)
  16. Stone slab
  17. Tile
  18. Wattle and daub
  19. Wood ( Level 3)
    1. Engineered wood
      1. Wood–plastic composite
    2. Lumber ( Level 4)
      1. Sawmill
    3. Wood drying
    4. Woodworking ( Level 4)
      1. Carpentry ( Level 4)

Environmental remediation

This section contains 9 articles.

  1. Environmental remediation
    1. Bioremediation
      1. Bioaugmentation
      2. Biostimulation
      3. Phytoremediation
    2. Groundwater remediation
    3. In situ chemical oxidation
    4. Soil vapor extraction
    5. Remediation of contaminated sites with cement

Infrastructure by type

This section contains 97 articles.

Architectural elements

This section contains 20 articles.

  1. Arch ( Level 4)
  2. Buttress
    1. Flying buttress
  3. Ceiling ( Level 4)
  4. Column ( Level 4)
  5. Dome ( Level 4)
  6. Door ( Level 4)
  7. Elevator ( Level 4)
  8. Façade ( Level 4)
  9. Floor ( Level 4)
  10. Foundation (engineering) ( Level 4)
  11. Ladder ( Level 4)
  12. Lighting ( Level 4)
  13. Pier (architecture)
  14. Roof ( Level 4)
  15. Room ( Level 4)
  16. Stairs ( Level 4)
  17. Vault (architecture)
  18. Wall ( Level 4)
  19. Window ( Level 4)

Coastal infrastructure

This section contains 10 articles.

  1. Dock ( Level 4)
    1. Dry dock
    2. Marina
  2. Harbor ( Level 4)
  3. Lighthouse ( Level 4)
  4. Pier ( Level 4)
    1. Maritime passenger terminal
  5. Port ( Level 4)
    1. Container port
  6. Seawall

Ceremonial buildings

This section contains 2 articles.

  1. Pagoda ( Level 4)
  2. Pyramid ( Level 4)

Commercial buildings

This section contains 3 articles.

  1. Convention center
  2. Office ( Level 4)
  3. Warehouse ( Level 4)

Mixed-use buildings

This section contains 3 articles.

  1. Tower block ( Level 4)
  2. Skyscraper ( Level 4)
  3. Tower ( Level 4)

Residential buildings and housing units

This section contains 10 articles.

  1. Apartment ( Level 4)
  2. House ( Level 4)
    1. Hut ( Level 4)
    2. Igloo ( Level 4)
    3. Palace ( Level 4)
    4. Villa ( Level 4)
  3. Hotel ( Level 4)
    1. Inn
    2. Motel
  4. Hostel

Rooms and spaces

This section contains 19 articles.

  1. Attic
  2. Balcony
  3. Basement
  4. Bathroom ( Level 4)
    1. Toilet (room)
  5. Bedroom ( Level 4)
  6. Courtyard
  7. Dining room
  8. Garage (residential) ( Level 4)
  9. Hall
  10. Kitchen ( Level 4)
  11. Laundry room
  12. Living room
  13. Lobby (room)
  14. Porch
  15. Patio
  16. Sauna ( Level 4)
  17. Study (room)
  18. Sunroom

Portable buildings and shelters

This section contains 2 articles.

  1. Tent ( Level 4)
  2. Yurt

Earthworks

This section contains 3 articles.

  1. Earthworks (engineering)
    1. Trench
  2. Undergrounding

Fire protection

This section contains 3 articles.

  1. Fire alarm system
  2. Fire hydrant
  3. Smoke detector

Hydraulic infrastructure

This section contains 10 articles.

  1. Cistern
  2. Dam ( Level 3)
    1. Caisson (engineering)
  3. Drainage ( Level 4)
    1. Sluice
  4. Dredging
  5. Flood control ( Level 4)
    1. Flood control in the Netherlands ( Level 4)
  6. Levee ( Level 4)
  7. Reservoir ( Level 4)

Transport infrastructure

This section contains 12 articles. See also #Transportation section

  1. Bridge ( Level 3)
    1. Cantilever bridge
    2. Drawbridge
    3. Flying junction
    4. Pontoon bridge
    5. Suspension bridge
    6. Viaduct
  2. Tunnel ( Level 4)
    1. Underwater tunnel
    2. Tunnel construction
      1. New Austrian tunneling method
      2. Tunnel boring machine

Specific infrastructure

This section contains 85 articles.

See "Transportation" and "Energy" section for infrastructure in respective discipline

Dams

This section contains 26 articles.

  1. Aswan Dam ( Level 4)
  2. Grand Coulee Dam
  3. Grand Ethiopian Renaissance Dam
  4. Hoover Dam ( Level 4)
  5. Itaipu Dam ( Level 4)
  6. Tarbela Dam
  7. Three Gorges Dam ( Level 4)
  8. Akosombo Dam
  9. Atatürk Dam
  10. Bratsk Hydroelectric Power Station
  11. Cahora Bassa
  12. Cofferdam
  13. New Croton Dam
  14. Delta Works
  15. Tabqa Dam
  16. Fort Peck Dam
  17. Grande Dixence Dam
  18. Guri Dam
  19. Enguri Dam
  20. Kariba Dam
  21. Mangla Dam
  22. Nurek Dam
  23. Oroville Dam
  24. Rogun Dam
  25. Sup'ung Dam
  26. Vajont Dam

Bridges

This section contains 49 articles.

  1. Akashi Kaikyo Bridge ( Level 4)
  2. Alcántara Bridge
  3. Arthur Kill Bridge
  4. Astoria–Megler Bridge
  5. Auckland Harbour Bridge
  6. Banpo Bridge
  7. Bosphorus Bridge
  8. Bridge of Sighs
  9. Bridge of the Americas
  10. Britannia Bridge
  11. Brooklyn Bridge ( Level 4)
  12. Charles Bridge
  13. Confederation Bridge
  14. Danyang–Kunshan Grand Bridge
  15. El Ferdan Railway Bridge
  16. Forth Bridge
  17. Gateshead Millennium Bridge
  18. George Washington Bridge
  19. Golden Gate Bridge ( Level 4)
  20. Great Belt Bridge
  21. Great Seto Bridge
  22. Humber Bridge
  23. Qingdao Jiaozhou Bay Bridge
  24. Kapellbrücke
  25. London Bridge ( Level 4)
  26. Mackinac Bridge
  27. Manhattan Bridge
  28. Mehmed Paša Sokolović Bridge
  29. Menai Bridge
  30. Millau Viaduct
  31. Minneapolis Skyway System
  32. Pont Alexandre III
  33. Pont du Gard
  34. Pont Neuf
  35. Ponte Sant'Angelo
  36. Ponte Vecchio
  37. Rainbow Bridge (Niagara Falls)
  38. Rainbow Bridge (Tokyo)
  39. Rialto Bridge
  40. San Francisco–Oakland Bay Bridge
  41. Si-o-se-pol
  42. Stari Most
  43. Sydney Harbour Bridge
  44. Tacoma Narrows Bridge
  45. The Iron Bridge
  46. Tower Bridge
  47. Trajan's Bridge
  48. Vasco da Gama Bridge
  49. Verrazzano-Narrows Bridge

Tunnels

This section contains 3 articles.

  1. Channel Tunnel ( Level 4)
  2. Gotthard Base Tunnel
  3. Seikan Tunnel

Multi-modal crossings

This section contains 5 articles.

  1. Bering Strait crossing
  2. Chesapeake Bay Bridge–Tunnel
  3. Hong Kong–Zhuhai–Macau Bridge
  4. Tokyo Bay Aqua-Line
  5. Øresund Bridge

Others

This section contains 2 articles.

  1. Multilevel streets in Chicago
  2. List of international submarine communications cables

Machinery and tools Information

This section contains 285 articles.

Machinery and tools: General

This section contains 10 articles.

  1. Machine ( Level 4)
  2. MEMS
    1. Micromachinery
    2. Nanoelectromechanical systems
  3. Robotics ( Level 3)
    1. Android (robot)
    2. Automaton
    3. Robot ( Level 4)
    4. Robotic arm
    5. Leg mechanism

Engines

This section contains 11 articles.

  1. Engine ( Level 3)
  2. Electric motor ( Level 3)
  3. Internal combustion engine ( Level 3)
    1. Diesel engine ( Level 4)
    2. Petrol engine
    3. Reciprocating engine
      1. Four-stroke engine ( Level 4)
      2. Two-stroke engine
    4. Pistonless rotary engine
      1. Wankel engine
  4. Steam engine ( Level 3)

Hydraulics and pneumatics

This section contains 26 articles.

  1. Hydraulics
    1. Hydraulic cylinder
    2. Hydraulic machinery
    3. Hydraulic motor
    4. Hydraulic manifold
    5. Pump
      1. Hydraulic ram
    6. Siphon ( Level 4)
  2. Pipe (fluid conveyance) ( Level 4)
    1. Gasket ( Level 4)
    2. Valve ( Level 4)
  3. Plumbing ( Level 4)
    1. Bidet
    2. Sink ( Level 4)
    3. Toilet ( Level 4)
      1. Flush toilet
      2. Portable toilet
      3. Squat toilet
      4. Toilet seat
      5. Urinal
  4. Pneumatics
    1. Compressor
    2. Jackhammer
    3. Nail gun
    4. Rivet gun
    5. Vacuum pump

Machinery

This section contains 63 articles.

Farm and garden machinery

This section contains 16 articles.

  1. Baler
  2. Chainsaw ( Level 4)
  3. Combine harvester ( Level 4)
  4. Corn harvester
  5. Cotton gin ( Level 4)
  6. Cotton picker
  7. Cultivator ( Level 4)
  8. Irrigation sprinkler ( Level 4)
  9. Lawn mower ( Level 4)
  10. Planter (farm implement)
  11. Reaper
  12. Reaper-binder
  13. Seed drill
  14. Swather
  15. Threshing machine
  16. Transplanter

Household appliances

This section contains 35 articles.

  1. Home appliance ( Level 4)
  2. Major appliance
  3. Barbecue grill
  4. Blender
  5. Clothes dryer ( Level 4)
  6. Coffeemaker
  7. Dishwasher ( Level 4)
  8. Furnace (central heating) ( Level 4)
  9. Hair dryer
  10. Hair iron
  11. Humidifier
  12. Ironing ( Level 4)
  13. Juicer
  14. Lock and key ( Level 4)
    1. Dead bolt
    2. Disc tumbler lock
    3. Electronic lock
    4. Lever tumbler lock
    5. Pin tumbler lock
    6. Skeleton key
  15. Microwave oven ( Level 4)
    1. Cavity magnetron ( Level 4)
  16. Mixer (appliance)
  17. Oven ( Level 3)
    1. Convection oven
  18. Refrigerator ( Level 4)
  19. Rice cooker
  20. Sewing machine ( Level 4)
  21. Slow cooker
  22. Stove ( Level 4)
    1. Electric stove
  23. Vacuum cleaner ( Level 4)
  24. Washing machine ( Level 4)
  25. Water dispenser
  26. Water heating

Industrial machinery

This section contains 12 articles.

  1. Centrifuge ( Level 4)
    1. Ultracentrifuge
  2. Crane (machine) ( Level 4)
  3. Forklift
  4. Mill (grinding)
  5. Machine tool
    1. Lathe ( Level 4)
    2. Machine press ( Level 4)
    3. Milling (machining)
    4. Numerical control
  6. Potter's wheel ( Level 4)
  7. Trip hammer

Mechanisms

This section contains 61 articles.

  1. Mechanism (engineering)

Flexible components

This section contains 15 articles.

  1. Belt (mechanical)
  2. Chain ( Level 4)
  3. Net (device)
    1. Mesh
      1. Sieve
  4. Rope ( Level 4)
    1. Knot ( Level 4)
      1. List of knots
      2. Bowline
      3. Double fisherman's knot
      4. Figure-eight knot
    2. Wire rope
      1. Bowden cable
      2. Flexible shaft
  5. Spring (device) ( Level 4)

Rigid components

This section contains 20 articles.

  1. Blade
  2. Fastener ( Level 4)
    1. Nail (fastener) ( Level 4)
    2. Nut (hardware) ( Level 4)
    3. Rivet ( Level 4)
    4. Screw
    5. Washer (hardware) ( Level 4)
  3. Gear ( Level 4)
  4. Hook
  5. Piston
  6. Simple machine ( Level 3)
    1. Inclined plane ( Level 4)
    2. Lever ( Level 4)
    3. Pulley ( Level 4)
      1. Block and tackle
    4. Screw mechanism ( Level 4)
      1. Propeller
    5. Wedge ( Level 4)
    6. Wheel ( Level 3)
      1. Flywheel

Simple mechanisms

This section contains 25 articles.

  1. Kinematic pair
    1. Ball joint
    2. Bearing (mechanical) ( Level 4)
    3. Cam follower
      1. Tappet
    4. Hinge
    5. Rack and pinion
    6. Ratchet (device)
    7. Rod end bearing
    8. Wheel and axle ( Level 4)
      1. Axle ( Level 4)
  2. Linkage (mechanical)
    1. Clutch ( Level 4)
    2. Differential (mechanical device)
    3. Epicyclic gearing
    4. Escapement
    5. Four-bar linkage
    6. Gimbal
    7. Pantograph
    8. Whippletree (mechanism)
  3. Shock absorber
    1. Dashpot
  4. Winch
    1. Capstan (nautical)
    2. Windlass

Tools

This section contains 114 articles.

  1. Tool ( Level 2)
  2. Lifting equipment
    1. Hoist (device)
    2. Jack (device)

Agricultural tools

This section contains 14 articles.

  1. Archimedes' screw ( Level 4)
  2. Flail
  3. Harrow (tool) ( Level 4)
  4. Hoe (tool) ( Level 4)
  5. Machete ( Level 4)
  6. Mattock
  7. Pitchfork
  8. Plough ( Level 4)
  9. Rake (tool) ( Level 4)
  10. Roller (agricultural tool)
  11. Scythe
  12. Sickle ( Level 4)
  13. Shadoof
  14. Shovel ( Level 4)

Artist's and drafting tools

This section contains 20 articles.

  1. Compass (drawing tool)
  2. Drafting machine
  3. Drawing board
  4. Easel
  5. Eraser
  6. French curve
  7. Ink ( Level 4)
  8. Modelling clay ( Level 4)
  9. Paint ( Level 4)
    1. Acrylic paint
    2. Enamel paint
    3. Varnish
  10. Brush ( Level 4)
  11. Pastel ( Level 4)
  12. Pencil ( Level 4)
  13. Pencil sharpener
  14. Pigment ( Level 4)
  15. Pen ( Level 4)
    1. Ballpoint pen
  16. T-square

Containers

This section contains 20 articles.

  1. Container ( Level 4)
  2. Aluminum can
  3. Bag
    1. Paper bag
    2. Plastic bag
  4. Barrel
  5. Basket
  6. Bottle
    1. Water bottle
  7. Box
    1. Cardboard box
    2. Coffin
    3. Crate
    4. Wooden box
  8. Envelope
  9. Intermodal container
  10. Packaging
  11. Paper cup
  12. Pressure vessel
  13. Steel and tin cans

Hand tools

This section contains 15 articles.

  1. Adze
  2. Axe ( Level 4)
  3. Chalk line
  4. Chisel ( Level 4)
  5. Clamp (tool) ( Level 4)
  6. Crowbar
  7. Drilling ( Level 4)
  8. Hammer ( Level 4)
  9. Hook (hand tool)
  10. Plane (tool) ( Level 4)
  11. Pliers
  12. Saw ( Level 4)
  13. Scissors ( Level 4)
  14. Screwdriver
  15. Wrench

Measuring instruments

This section contains 21 articles.

  1. Instrumentation ( Level 4)
    1. Barometer ( Level 4)
    2. Calipers ( Level 4)
    3. Feeler gauge
    4. Ruler ( Level 4)
      1. Meterstick
      2. Tape measure
    5. Photometer ( Level 4)
    6. Spectrometer ( Level 4)
      1. Optical spectrometer
    7. Thermometer ( Level 4)
    8. Astrolabe
    9. Breathalyzer
    10. Calorimeter
    11. Geiger counter
    12. Odometer
    13. Seismometer
    14. Speedometer
    15. Torque wrench
    16. Vernier scale
  2. Polygraph

Surveying tools

This section contains 20 articles.

  1. Alidade
  2. Circumferentor
  3. Graphometer
  4. Gunter's chain
  5. Laser rangefinder
    1. Lidar
  6. Level (optical instrument)
    1. Inclinometer
      1. Topographic Abney level
    2. Level staff
    3. Plumb bob
    4. Spirit level
    5. Tiltmeter
  7. Plane table
  8. Reticle
  9. Stadimeter
    1. Stadia mark
  10. Surveyor's wheel
  11. Theodolite ( Level 4)
    1. Total station

Medical technology Information

This section contains 30 articles.

Military technology Information

This section contains 303 articles.

Military technology: General

This section contains 8 articles.

  1. Weapon ( Level 3)
  2. Military technology ( Level 4)
  3. Booby trap
    1. Punji stick
    2. Trou de loup
  4. Siege engine
    1. Battering ram ( Level 4)
    2. Siege tower

Countermeasures

This section contains 27 articles.

  1. Stealth technology ( Level 4)
  2. Missile defense

Armour

This section contains 11 articles.

  1. Armour ( Level 3)
    1. Body armor
      1. Bulletproof vest ( Level 4)
      2. Chain mail ( Level 4)
      3. Plate armour ( Level 4)
    2. Vehicle armour
      1. Reactive armour
  2. Helmet ( Level 4)
    1. Combat helmet
  3. Shield ( Level 4)
    1. Scutum

Fortification

This section contains 14 articles.

  1. Fortification ( Level 3)
    1. Bastion fort
      1. Glacis
      2. Ravelin
      3. Tenaille
    2. Castle ( Level 4)
      1. Motte-and-bailey castle
      2. Bastion
      3. Curtain wall (fortification)
      4. Gatehouse
      5. Keep
    3. Defensive wall ( Level 4)
      1. Palisade
      2. Rampart (fortification)

Melee weapons

This section contains 41 articles.

  1. Melee weapon
  2. Battle axe ( Level 4)
  3. Brass knuckles
  4. Club (weapon) ( Level 4)
    1. Baton (law enforcement)
    2. Mace (bludgeon)
    3. War hammer
  5. Flail (weapon)
    1. Nunchaku
  6. Sai (weapon)
  7. Tonfa


Knives

This section contains 10 articles.

  1. Bayonet ( Level 4)
  2. Knife ( Level 3)
  3. Dagger ( Level 4)
    1. Bowie knife
  4. Hunting knife
  5. Pocketknife
    1. Swiss Army knife
    2. Switchblade
  6. Throwing knife
  7. Utility knife

Polearms

This section contains 8 articles.

  1. Polearm
  2. Dagger-axe
    1. Ji (polearm)
  3. Halberd
  4. Naginata
  5. Partisan (weapon)
  6. Spear ( Level 4)
    1. Pike (weapon)

Swords

This section contains 12 articles.

  1. Sword ( Level 4)
  2. Claymore
  3. Cutlass
  4. Dao (Chinese sword)
  5. Gladius
  6. Katana ( Level 4)
  7. Longsword
  8. Rapier ( Level 4)
  9. Sabre
  10. Scimitar
  11. Talwar
  12. Wakizashi

Ranged weapons

This section contains 107 articles.

  1. Ranged weapon
  2. Boomerang ( Level 4)
  3. Javelin
    1. Spear-thrower
  4. Shuriken
  5. Sling (weapon) ( Level 4)
  6. Slingshot

Archery

This section contains 11 articles.

  1. Bow and arrow ( Level 3)
    1. Compound bow
    2. Longbow
    3. Recurve bow
  2. Arrow
    1. Arrowhead
    2. Fletching
  3. Bowstring
  4. Crossbow ( Level 4)
    1. Repeating crossbow
  5. Quiver

Artillery

This section contains 13 articles.

  1. Artillery ( Level 4)
  2. Cannon ( Level 4)
    1. Field gun
    2. Howitzer
    3. Limbers and caissons
    4. Mortar (weapon) ( Level 4)
  3. Catapult ( Level 4)
    1. Ballista ( Level 4)
      1. Polybolos
    2. Mangonel
    3. Onager (weapon)
    4. Trebuchet
  4. Railgun

Firearms

This section contains 65 articles.

  1. Firearm ( Level 3)
    1. Fire lance
    2. Hand cannon
    3. Gun
  2. Handgun ( Level 4)
    1. Revolver
    2. Pistol
  3. Long gun
    1. Arquebus
    2. Musket ( Level 4)
    3. Rifle ( Level 4)
      1. Assault rifle ( Level 4)
      2. Sniper rifle
    4. Shotgun ( Level 4)
    5. Submachine gun
  4. Machine gun ( Level 4)
  5. Autocannon
    1. Rotary cannon

Ammunition

This section contains 15 articles.

  1. Ammunition ( Level 4)
    1. Ammunition box
  2. Gunpowder ( Level 3)
    1. Powder keg
    2. Smokeless powder
  3. Bullet
    1. Armor-piercing bullet
    2. Hollow-point bullet
    3. Tracer ammunition
  4. Flechette
  5. Cartridge (firearms)
    1. Sabot (firearms)
  6. Shotgun shell
    1. Shot (pellet)
  7. Shotgun slug

Mechanisms

This section contains 19 articles.

  1. Breechloader
    1. Action (firearms)
      1. Automatic firearm
      2. Bolt action
      3. Burst mode (weapons)
      4. Repeating firearm
      5. Selective fire
      6. Semi-automatic firearm
    2. Firing pin
    3. Magazine (firearms)
  2. Gun barrel
    1. Multiple-barrel firearm
    2. Rifling
  3. Muzzleloader
    1. Flintlock
    2. Matchlock
    3. Percussion cap
    4. Wheellock
  4. Trigger (firearms)

Specific cartridges

This section contains 2 articles.

  1. 9×19mm Parabellum
  2. 5.56×45mm NATO

Specific firearms

This section contains 11 articles.

  1. AK-47
  2. AR-15–style rifle
  3. Chassepot
  4. Dreyse needle gun
  5. Gatling gun
  6. Glock
  7. IWI Tavor
  8. M134 Minigun
  9. M4 carbine
  10. M16 rifle
  11. M1911 pistol

Missiles

This section contains 11 articles.

  1. Missile ( Level 4)
    1. Air-to-air missile
    2. Anti-tank guided missile
    3. Cruise missile
    4. Intercontinental ballistic missile
    5. Rocket-propelled grenade
    6. Surface-to-air missile
      1. Man-portable air-defense system
  2. Missile guidance
  3. Multiple rocket launcher
  4. Warhead

Explosive weapons

This section contains 15 articles.

  1. Bomb ( Level 4)
    1. Improvised explosive device ( Level 4)
      1. Car bomb
    2. Detonator
    3. Fuze
      1. Contact fuze
      2. Proximity fuze
  2. Cluster munition ( Level 4)
  3. Grenade ( Level 4)
  4. Land mine ( Level 4)
  5. Plastic explosive
  6. Shaped charge
    1. Explosively formed penetrator
    2. High-explosive anti-tank
  7. Thermobaric weapon

Incendiary weapons

This section contains 5 articles.

  1. Greek fire
  2. Flamethrower
  3. Molotov cocktail
  4. Napalm ( Level 4)
  5. White phosphorus munitions

Maneuver

This section contains 9 articles.

  1. Horses in warfare ( Level 4)
    1. Caltrop
    2. Chariot ( Level 4)
  2. Infantry fighting vehicle
    1. Armoured personnel carrier
    2. Technical (vehicle)
  3. Tank ( Level 4)
    1. Main battle tank
  4. War elephant ( Level 4)

Military aviation

This section contains 45 articles.

  1. Military aviation
  2. Military aircraft ( Level 4)
    1. Military glider
    2. Military helicopter
  3. Attack aircraft ( Level 4)
    1. Gunship
  4. Bomber ( Level 4)
    1. Strategic bomber
    2. Heavy bomber
    3. Medium bomber
    4. Interdictor
    5. Penetrator (aircraft)
  5. Fighter aircraft ( Level 4)
    1. Air superiority fighter
    2. Interceptor aircraft
    3. Fighter-bomber
    4. Strike fighter
  6. Electronic-warfare aircraft
  7. Maritime patrol aircraft
  8. Multirole combat aircraft
  9. Military transport aircraft
  10. Airborne early warning and control
  11. Reconnaissance aircraft
  12. Surveillance aircraft
  13. Experimental aircraft
  14. Aerial refueling

Specific aircraft

This section contains 19 articles.

  1. Boeing B-29 Superfortress
    1. Enola Gay
  2. Boeing B-52 Stratofortress
  3. Dassault Rafale
  4. Embraer EMB 314 Super Tucano
  5. Eurofighter Typhoon
  6. Fairchild Republic A-10 Thunderbolt II
  7. General Dynamics F-16 Fighting Falcon
  8. Lockheed C-130 Hercules
  9. Lockheed SR-71 Blackbird
  10. Lockheed Martin F-22 Raptor
  11. Lockheed Martin F-35 Lightning II
  12. McDonnell Douglas F-15 Eagle
  13. McDonnell Douglas F/A-18 Hornet
  14. Mikoyan-Gurevich MiG-21
  15. North American P-51 Mustang
  16. Northrop Grumman B-2 Spirit
  17. Panavia Tornado
  18. Rockwell B-1 Lancer

Naval warfare

This section contains 20 articles.

  1. Warship ( Level 4)
    1. Aircraft carrier ( Level 4)
    2. Battleship ( Level 4)
      1. Dreadnought
    3. Corvette
    4. Cruiser
    5. Destroyer
    6. Frigate
    7. Galleon
    8. Galley ( Level 4)
      1. Trireme
    9. Gunboat
    10. Ironclad warship
    11. Ship of the line ( Level 4)
  2. Submarine ( Level 4)
  3. Boom (navigational barrier)
    1. Anti-submarine net
  4. Depth charge
  5. Naval mine ( Level 4)
  6. Torpedo ( Level 4)

Less-lethal weapons

This section contains 14 articles.

  1. Non-lethal weapon
  2. Active Denial System
  3. Baton round
    1. Bean bag round
    2. Plastic bullet
    3. Rubber bullet
    4. Sponge grenade
  4. Sonic weapon
  5. Stun grenade
  6. Taser
  7. Tear gas
    1. CS gas
    2. Pepper spray
  8. Water cannon

Weapon of mass destruction

This section contains 12 articles.

  1. Weapon of mass destruction ( Level 4)
  2. Biological warfare ( Level 4)
    1. Entomological warfare
  3. Chemical weapon ( Level 4)
    1. Blister agent
    2. Blood agent
    3. Nerve agent
  4. Dirty bomb
  5. Nuclear weapon ( Level 3)
    1. Thermonuclear weapon ( Level 4)
    2. Nuclear weapon design
    3. Nuclear proliferation

Navigation and timekeeping Information

This section contains 87 articles. For units of time (hour, day, etc.), see Physical sciences – Measurement. For maps and cartography, see Geography – Physical geography.

Navigation

This section contains 23 articles.

  1. Navigation ( Level 3)
  2. Compass ( Level 3)
  3. Cardinal direction ( Level 4)
    1. North
    2. South
    3. East
    4. West
  4. Celestial navigation ( Level 4)
    1. Backstaff
    2. Jacob's staff
    3. Octant (instrument)
    4. Quadrant (instrument)
    5. Sextant ( Level 4)
  5. Dead reckoning ( Level 4)
  6. Gyroscope ( Level 4)
  7. Satellite navigation ( Level 4)
    1. BeiDou
    2. Galileo (satellite navigation)
    3. Global Positioning System ( Level 4)
    4. GLONASS
    5. Satellite navigation device
  8. Radar ( Level 3)
  9. Sonar ( Level 4)

Timekeeping

This section contains 64 articles.

  1. Astronomical year numbering
  2. Calendar ( Level 3)
  3. Clock ( Level 3)
  4. Leap year ( Level 4)
  5. Leap second
  6. Future
  7. Present
  8. Past
  9. Standard time
  10. Timeline
  11. Time standard
    1. Coordinated Universal Time ( Level 4)
    2. Greenwich Mean Time
    3. International Atomic Time
  12. Time zone ( Level 4)
    1. Daylight saving time ( Level 4)

Calendars

This section contains 12 articles.

  1. Solar calendar
    1. Gregorian calendar ( Level 4)
      1. Anno Domini
      2. Common Era
    2. Julian calendar ( Level 4)
  2. Lunisolar calendar
    1. Buddhist calendar
    2. Chinese calendar ( Level 4)
    3. Hindu calendar
  3. Lunar calendar
    1. Hebrew calendar
    2. Islamic calendar ( Level 4)

Clocks

This section contains 16 articles.

  1. 12-hour clock
  2. 24-hour clock
  3. Alarm clock
  4. Atomic clock ( Level 4)
  5. Digital clock
  6. Clock face
  7. Hourglass
  8. Marine chronometer
  9. Pendulum clock
    1. Pendulum ( Level 4)
  10. Quartz clock
  11. Sundial ( Level 4)
  12. Watch ( Level 4)
    1. Pocket watch
    2. Stopwatch
  13. Water clock

Months

This section contains 12 articles.

  1. January
  2. February
  3. March
  4. April
  5. May
  6. June
  7. July
  8. August
  9. September
  10. October
  11. November
  12. December

Days of the Week

This section contains 8 articles.

  1. Names of the days of the week
  2. Sunday
  3. Monday
  4. Tuesday
  5. Wednesday
  6. Thursday
  7. Friday
  8. Saturday

Optical technology Information

This section contains 58 articles.

Astronomical technology Information

This section contains 71 articles.

  1. Astronomical catalog
  2. Ephemeris
  3. Star chart
  4. Astronomical Almanac

Telescope

This section contains 67 articles.

  1. Telescope ( Level 3)
  2. Reflecting telescope
    1. Cassegrain reflector
    2. Dobsonian telescope
    3. Gregorian telescope
    4. Newtonian telescope
    5. Ritchey–Chrétien telescope
    6. Schmidt–Cassegrain telescope
  3. Refracting telescope
  4. X-ray telescope
  5. Optical telescope ( Level 4)
  6. Infrared telescope
  7. Radio telescope ( Level 4)
  8. Solar telescope
  9. Space telescope
  10. Astronomical interferometer
    1. Aperture synthesis
  11. Telescope mount
    1. Altazimuth mount
    2. Equatorial mount
  12. Active optics
  13. Adaptive optics
  14. Eyepiece
  15. Astronomical filter
  16. Primary mirror
  17. Gravitational-wave observatory

Space-based observatories

This section contains 15 articles.

  1. Hubble Space Telescope ( Level 4)
  2. Spitzer Space Telescope
  3. Herschel Space Observatory
  4. INTEGRAL
  5. Fermi Gamma-ray Space Telescope
  6. James Webb Space Telescope
  7. Wide-field Infrared Survey Explorer
  8. IRAS
  9. Chandra X-ray Observatory
  10. Kepler
  11. GALEX
  12. Hipparcos
  13. Gaia (spacecraft)
  14. XMM-Newton
  15. ROSAT

Ground-based observatories

This section contains 26 articles.

  1. Atacama Large Millimeter Array ( Level 4)
  2. Mauna Kea Observatories ( Level 4)
    1. Subaru Telescope
    2. Thirty Meter Telescope
    3. W. M. Keck Observatory
  3. Gemini Observatory
  4. Five-hundred-meter Aperture Spherical Telescope
  5. LIGO
  6. Virgo interferometer
  7. IceCube Neutrino Observatory
  8. Very Large Telescope
  9. Large Binocular Telescope
  10. Mount Wilson Observatory
  11. Very Large Array
  12. Very Long Baseline Array
  13. Arecibo Observatory
  14. Green Bank Telescope
  15. Effelsberg 100-m Radio Telescope
  16. Low-Frequency Array
  17. MeerKAT
  18. Square Kilometre Array
  19. Extremely Large Telescope
    1. Giant Magellan Telescope
  20. Wise Observatory
  21. South Pole Telescope
  22. Jodrell Bank Observatory

Space Information

This section contains 73 articles.

Basics

This section contains 18 articles.

  1. Spaceflight ( Level 3)
    1. Sub-orbital spaceflight
    2. Orbital spaceflight
  2. Spacecraft ( Level 4)
  3. Rocket ( Level 3)
    1. Launch pad ( Level 4)
    2. Launch vehicle ( Level 4)
    3. Rocket engine ( Level 4)
  4. Satellite ( Level 3)
  5. Space station ( Level 3)
  6. Astronaut ( Level 4)
    1. Space suit
  7. Space capsule
  8. Uncrewed spacecraft
  9. Interstellar travel
  10. Space colonization
  11. Space habitat
  12. Space industry

Programs and launch sites

This section contains 16 articles.

  1. NASA ( Level 4)
    1. Apollo program ( Level 4)
    2. Kennedy Space Center ( Level 4)
    3. Project Gemini
    4. Project Mercury
  2. Soviet space program ( Level 4)
    1. Baikonur Cosmodrome ( Level 4)
    2. Vostok programme
    3. Voskhod programme
    4. Soyuz programme
  3. Roscosmos ( Level 4)
  4. European Space Agency ( Level 4)
  5. China National Space Administration ( Level 4)
  6. ISRO
  7. Israel Space Agency
  8. JAXA

Crewed vehicles

This section contains 12 articles.

  1. Apollo 11
  2. International Space Station ( Level 4)
  3. Mir ( Level 4)
  4. Salyut 1
  5. Space Shuttle ( Level 4)
    1. Space Shuttle Challenger disaster
    2. Space Shuttle Columbia disaster
  6. Saturn V ( Level 4)
  7. Soyuz (spacecraft) ( Level 4)
  8. Skylab
  9. Tiangong space station
  10. Vostok 1

Unmanned spacecraft

This section contains 18 articles.

  1. Sputnik 1 ( Level 4)
  2. Sputnik 2
  3. Luna 2
  4. Luna 3
  5. Mariner 2
  6. Luna 9
  7. Voyager program ( Level 4)
    1. Voyager 1
    2. Voyager 2
  8. Pioneer program
    1. Pioneer 10
    2. Pioneer 11
  9. New Horizons
  10. Galileo project
  11. Cassini–Huygens
  12. Cosmic Background Explorer
  13. Wilkinson Microwave Anisotropy Probe
  14. MESSENGER

Rovers

This section contains 9 articles.

  1. Rover (space exploration)
  2. Mars rover
    1. Perseverance (rover)
    2. Curiosity (rover)
    3. Spirit (rover)
    4. Opportunity (rover)
    5. Sojourner (rover)
  3. Lunar rover
    1. Lunokhod 1

Transportation Information

This section contains 457 articles.

Basics

This section contains 20 articles.

Ground transport

This section contains 164 articles.

Concepts of ground transport

This section contains 22 articles.

  1. Land transport
    1. Road transport ( Level 4)
  2. Breakdown (vehicle)
  3. Charging station
  4. Driving ( Level 4)
  5. Filling station ( Level 4)
  6. Parking ( Level 4)
    1. Parking lot
  7. Service (motor vehicle)
    1. Automobile repair shop
    2. Bus garage
    3. Car wash
    4. Rail yard
  8. Rest area
  9. Tire ( Level 4)
  10. Transport hub
    1. Bus station
    2. Bus stop
    3. Train station ( Level 4)
      1. Goods station
      2. Railway platform
    4. Park and ride

Road infrastructure

This section contains 24 articles. For bridges and tunnels, see transport infrastructure in #Infrastructure section.

  1. Road ( Level 3)
    1. Byway (road)
    2. Dirt road
    3. Highway ( Level 4)
      1. Controlled-access highway ( Level 4)
    4. Road junction
      1. Interchange (road)
        1. Stack interchange
      2. Intersection (road)
        1. Traffic light
        2. Traffic sign
    5. Toll road
  2. Footpath
  3. Pedestrian crossing
  4. Pedestrian zone
  5. Sidewalk
  6. Trail ( Level 4)
  7. Cycling infrastructure
    1. Bicycle boulevard
    2. Bike lane
    3. Bicycle parking rack
    4. Shared-use path
    5. Bicycle-sharing system
    6. Cycle track

Motorized road transport

This section contains 54 articles.

  1. Auto rickshaw
  2. Bus ( Level 4)
    1. Articulated bus
    2. Bus rapid transit
    3. Coach (bus)
    4. Double-decker bus
    5. Minibus
    6. Public transport bus service
    7. School bus
    8. Trolleybus
  3. Car ( Level 3)
    1. Convertible
    2. Coupe
    3. Electric car
    4. Grand tourer
    5. Hatchback
    6. Limousine
    7. Luxury car
    8. Microcar
    9. Muscle car
    10. Sedan (automobile)
    11. Sports car
    12. Station wagon
    13. Supercar
    14. T-top
  4. Motorcycle ( Level 4)
    1. Chopper (motorcycle)
    2. Minibike
    3. Moped
    4. Rat bike
    5. Scooter (motorcycle)
      1. Kick scooter
      2. Motorized scooter
      3. Scooter-sharing system
    6. Sport bike
  5. Off-road vehicle
    1. All-terrain vehicle
    2. Dune buggy
    3. Snowmobile
  6. Shared transport
    1. Carpool
    2. Demand-responsive transport
  7. Truck ( Level 4)
    1. Flatbed truck
    2. Monster truck
    3. Pickup truck
    4. Semi-trailer truck
    5. SUV
  8. Van ( Level 4)
    1. Minivan
  9. Vehicle for hire
    1. Motorcycle taxi
    2. Share taxi
    3. Taxi ( Level 4)

Rail and cable transport

This section contains 28 articles.

  1. Rail transport ( Level 4)
    1. Railway track ( Level 4)
      1. Elevated railway
    2. Railway electrification
  2. Train ( Level 3)
    1. Locomotive ( Level 4)
      1. Electric locomotive
      2. Diesel locomotive
      3. Steam locomotive ( Level 4)
    2. Railroad car
    3. Rolling stock
    4. Passenger train
    5. Rail freight transport
    6. Freight train
  3. Cable transport ( Level 4)
    1. Aerial tramway ( Level 4)
    2. Cable car (railway)
    3. Funicular
    4. Gondola lift
    5. Ski lift
  4. High-speed rail ( Level 4)
  5. Tram ( Level 4)
    1. Interurban
    2. Light rail
  6. Rapid transit ( Level 4)
    1. Commuter rail
    2. Medium-capacity rail system
      1. Monorail ( Level 4)

Animal-powered transport

This section contains 7 articles.

  1. Carriage ( Level 4)
    1. Surrey (carriage)
  2. Cart ( Level 4)
  3. Horsecar
  4. Saddle ( Level 4)
  5. Stirrup
  6. Stagecoach

Human-powered transport

This section contains 15 articles.

  1. Bicycle ( Level 3)
    1. Bicycle brake
    2. Bicycle gearing
    3. Derailleur
    4. Shifter (bicycle part)
    5. BMX bike
    6. Electric bicycle
    7. Mountain bike
    8. Penny-farthing
    9. Recumbent bicycle
    10. Tandem bicycle
  2. Handcar
  3. Rickshaw ( Level 4)
  4. Tricycle
  5. Unicycle

Specific-purpose transportation

This section contains 12 articles. For medical transport, see Medical section

  1. Baby transport ( Level 4)
  2. Fire engine
  3. Paratransit
  4. Pipeline ( Level 4)
  5. Police car
  6. Heavy equipment
    1. Bulldozer
    2. Dump truck
    3. Excavator
    4. Road roller
      1. Steamroller
    5. Tractor ( Level 4)

Specific automobiles

This section contains 2 articles.

  1. Ford Model T
  2. Volkswagen Beetle

Naval transport

This section contains 65 articles. For military watercraft, see Military technology. For pier and port, see coastal infrastructure.

Aviation

This section contains 113 articles.

Specific aircraft

This section contains 29 articles. For military aircraft, see Military technology

Airports

This section contains 14 articles.

Specific transportation systems

This section contains 95 articles.

Ground transportation networks

This section contains 11 articles. See Geography/Physical for Maritime transportation network. See Society/Politic and economic for companies that operate transportation networks.

  1. Intercontinental and transoceanic fixed links
  2. Arab Mashreq International Road Network
  3. Asian Highway Network
  4. Autobahn
  5. Interstate Highway System
  6. Trans-African Highway network
  7. Trans-European Transport Network
    1. Trans-European high-speed rail network
  8. EuroVelo
  9. European long-distance paths
  10. Transcontinental railroad

Rapid transit

This section contains 67 articles.

Africa

This section contains 1 article.

  1. Cairo Metro

Americas

This section contains 14 articles.

  1. Caracas Metro
  2. Mexico City Metro
  3. Santiago Metro
  4. TransMilenio
Brazil

This section contains 2 articles.

  1. Rio de Janeiro Metro
  2. São Paulo Metro
Canada

This section contains 3 articles.

  1. Montreal Metro
  2. Toronto subway
  3. SkyTrain (Vancouver)
United States

This section contains 5 articles.

  1. Bay Area Rapid Transit
  2. Chicago "L"
  3. Massachusetts Bay Transportation Authority
  4. New York City Subway ( Level 4)
  5. Washington Metro

Asia

This section contains 24 articles.

  1. Dubai Metro
  2. TransJakarta
  3. Mass Rapid Transit (Singapore)
  4. Taipei Metro
  5. Tehran Metro
China

This section contains 6 articles.

  1. Beijing Subway
  2. Chongqing Rail Transit
  3. Guangzhou Metro
  4. MTR
  5. Shanghai Metro
  6. Shenzhen Metro
India

This section contains 5 articles.

  1. Delhi Metro
  2. Hyderabad Metro
  3. Kolkata Metro
  4. Mumbai Metro
  5. Namma Metro
Japan

This section contains 6 articles.

  1. Hiroshima Electric Railway
  2. Nagoya Municipal Subway
  3. Osaka Metro
  4. Sapporo Municipal Subway
  5. Tokyo Metropolitan Bureau of Transportation
  6. Tokyo Metro
South Korea

This section contains 2 articles.

  1. Busan Metro
  2. Seoul Metropolitan Subway

Europe

This section contains 27 articles.

  1. Athens Metro
  2. Brussels Metro
  3. Budapest Metro
  4. Istanbul Metro
  5. Kyiv Metro
  6. Prague Metro
  7. Vienna U-Bahn
France

This section contains 3 articles.

  1. Lyon Metro
  2. Paris Métro
  3. Réseau Express Régional
Germany

This section contains 3 articles.

  1. Berlin U-Bahn
  2. Munich U-Bahn
  3. S-Bahn
Italy

This section contains 2 articles.

  1. Milan Metro
  2. Rome Metro
Netherlands

This section contains 2 articles.

  1. Amsterdam Metro
  2. Rotterdam Metro
Russia

This section contains 2 articles.

  1. Moscow Metro
  2. Saint Petersburg Metro
Scandinavia

This section contains 4 articles.

  1. Copenhagen Metro
  2. Helsinki Metro
  3. Oslo Metro
  4. Stockholm Metro
Spain

This section contains 2 articles.

  1. Barcelona Metro
  2. Madrid Metro
United Kingdom

This section contains 2 articles.

  1. Glasgow Subway
  2. London Underground ( Level 4)

Oceania

This section contains 1 article.

  1. Sydney Metro

High-speed rail

This section contains 11 articles.

  1. Acela
  2. AVE
  3. China Railway High-speed
  4. Eurostar
  5. Frecciarossa
  6. Intercity Express
  7. Korea Train Express
  8. Shinkansen ( Level 4)
  9. Taiwan High Speed Rail
  10. TGV
  11. Sapsan

Railway lines

This section contains 4 articles.

  1. Trans-Australian Railway
  2. Chinese Eastern Railway
  3. Trans-Mongolian Railway
  4. Trans-Siberian Railway ( Level 4)

Railway services

This section contains 2 articles.

  1. Indian Pacific
  2. Orient Express