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Phi is a symbol used when describing grain size in sedimentology. Wentworth and Krumbian scales both use φ to describe the size of individual sediment particles.
This should be added to the list of scientific measurements that utilize phi.
See more here: /info/en/?search=Grain_size
the first line "lowercase φ or ϕ" shows two identical symbols on my computer and it's not clear how they are distinguished. i'm not sure how you could guarantee that both different symbols are shown.
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CHANGE "In philosophy, φ is often used as shorthand for a generic act. (Also in uppercase.)" to "In philosophy, φ (or Φ) is often used as shorthand for a generic act."