Υυ
Υυ, τό, indecl., twenty-third letter of the Formello abecedarium, IG 14.2420 , but twentieth of the Ion. alphabet: as numberal ύ = 400 , but υ| = 400 , 000 . It is called τὸ ὖ by Cra. 393d , Callias ap. 10.453d (prob., the line ends ταῦ, <τὸ> ὖ), IG 22.2783.4 (iv B. C.), ap. Bibl. p.530 ; τό τ’ ὖ or τό θ’ ὗ might be read in 33.3 for τοῦ ῡ codd. ; later τὸ υ ψιλόν or τὸ ψιλὸν υ (as name of the first letter of ὕαλος, υἱός, etc.), Can. 18 , Sch. Pl. 896 , Ps. Epim. 116 , 137 , al.: so named to distinguish it from ἡ ο’ῑ δίφθογγος, υ and οι being pronounced alike in late Gr.; ὗ is aspirated in AP 9.385.20 (Steph.Gramm.), 11.67.1 ( ) cod.Pal.; the Coptic name
A). he (cf. Arm. hiun) may indicate that the early name was ὗ, which seems also to be implied by Serv.ad Verg. A. 1.744 : alii dicunt Hyadas dictas vel ab Y littera, vel ἀπὸ τοῦ ὑός, cf. Sch. 18.486 : the sign Y represents hy on coins of P. Plautius Hypsaeus ( 58 B.C.), which are inscribed Ypsae, BMus.Cat.Republ.Coins, Plate 48 Nos. 2 , 3 , 4 , 5 , but Hupsae, Nos. 13 , 14 , Plate 123 Nos. 7 , 8 , 9 .