Upsilon

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

Upsilon (US: , UK: ; uppercase Υ, lowercase υ; Greek: ύψιλον ýpsilon [ˈipsilon]) or ypsilon is the twentieth letter of the Greek alphabet. In the system of Greek numerals, Υʹ has a value of 400. It is derived from the Phoenician waw (𐤅).

Excerpt from the Wikipedia article “Upsilon”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dcoetzee, F l a n k e r, Public domain, via Wikimedia Commons.