S: (n) X, x, ex (the 24th letter of the Roman alphabet)
S: (n) Y, y, wye (the 25th letter of the Roman alphabet)
S: (n) Z, z, zee, zed, ezed, izzard (the 26th letter of the Roman alphabet) "the British call Z zed and the Scots call it ezed but Americans call it zee"; "he doesn't know A from izzard"
S: (n) alpha (the 1st letter of the Greek alphabet)
S: (n) beta (the 2nd letter of the Greek alphabet)
S: (n) gamma (the 3rd letter of the Greek alphabet)
S: (n) delta (the 4th letter of the Greek alphabet)
S: (n) taw (the 23rd letter of the Hebrew alphabet)
S: (n) polyphone, polyphonic letter (a letter that has two or more pronunciations) "`c' is a polyphone because it is pronounced like `k' in `car' but like `s' in `cell'"