Upsilon

This article is about the Greek upsilon and is not to be confused with Epsilon, ʊ, or Y. For other uses, see Upsilon (disambiguation) and Ypsilon (disambiguation).

Upsilon (US: /ˈʌpsɪˌlɒn, ˈ(j)uːp-, -lən/, UK: /(j)uːpˈsaɪlən, ʊp-, -lɒn/ ⓘ; uppercase Υ, lowercase υ; Greek: ύψιλον ýpsilon [ˈipsilon]) or ypsilon /ɪp-/ 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 .

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