Upsilon

Upsilon (/ˈʌpsɪˌlɒn, ˈ(j)p-, -lən/, UK also /(j)pˈslən, 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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