ETYM Greek upsilon bare, mere, simple y.
The 20th letter of the Greek alphabet.
Twentieth letter (U, u) of Greek alphabet.

25th letter in the English alphabet, derived through the later Latin alphabet from the Greek letter upsilon (U, u). In English it represents the same vowel sounds as i when used as a vowel (myth, tryst), and as a semivowel, phonetic j (yoke, yacht), it is a palatal approximant.