ASCII Character Υ

Upsilon (/ˈʌpsɪˌlɒn, ˈ(j)uːp-, -lən/, UK also /(j)uːpˈsaɪlən, ʊp-, -lɒn/; uppercase Υ, lowercase υ; Greek: ύψιλον ýpsilon [ˈipsilon]) or ypsilon /ɪp-/ is the 20th 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. The name of the letter was originally just "υ" (y; also called hy, hence "hyoid", meaning "shaped like the letter υ"), but the name changed to "υ ψιλόν" u psilon 'simple u' to distinguish it from οι, which had come to have the same [y] pronunciation. Four letters of the Latin alphabet arose from it: and U , Y and, much later, V and W. In the Cyrillic script, the letters U (У, у) and izhitsa (Ѵ, ѵ) arose from it.