U+03C5 "υ" Greek Small Letter Upsilon Unicode Character

U+03C5 "υ" Greek Small Letter Upsilon is the twenty-second letter of the Greek alphabet, derived from the Phoenician letter waw, and serves as the ancestor of the Latin letters U, V, W, and Y. In modern Greek, it represents the close front rounded vowel sound /i/ when used as a vowel, similar to the English "ee," and as a consonant it can indicate a voiced labiodental fricative /v/ in certain diphthongs. Historically, this character has played a significant role in linguistics and mathematics, where it often symbolizes physical quantities such as the coefficient of kinematic viscosity or the upsilon meson in particle physics. Its lowercase form is visually distinct from the uppercase Greek letter Y, which is identical in shape to the Latin Y.