Upsilon
Twentieth letter in the Greek alphabet
Upsilon
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).
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