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This text in the opening sentence has been corrupted:

A pinnacle (from Latin pinnaculum, a little feather, pinna; the Greek irrepirytov , diminutive of nT~PUE , wing, is also used in this sense) is…

— Herbee 17:35, 2004 May 17 (UTC)

Pinnacle: Mitchell Stewart Semester 1 2006.

I object as to the etymology of the term referring to "feather". Feather in Latin is most commonly penna. In this sense, I see more likely a reference to pinus and pinna (pine cone) of the kind used to crown colums, fountains, etc. in ancient Rome. Therefore the term pinnaculum. There's plenty of architectural examples that could support this thesis, not least the Cortile della Pigna in the Vatican City with Bernini's famous pinnacle.

Alcinoos

it means culmination of climax: