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Ἓν οἶδα, ὅτι οὐδὲν οἶδα –> I know only one thing, that I know nothing | all I know is that I know nothing.
Diogenes Laertius, Lives of the Philosophers, Book 2 sec. 32.
Full diacritics: Υυ Medium diacritics: Υυ Low diacritics: Υυ Capitals: ΥΥ
Transliteration A: Yu Transliteration B: Yy Transliteration C: Yy Beta Code: *uu

English (LSJ)

τό, indecl., twenty-third letter of the Formello abecedarium, IG14.2420, but twentieth of the Ion. alphabet: as numberal ύ = 400, but = 400,000. It is called τὸ ὖ by Pl.Cra.393d, Callias ap.Ath.10.453d (prob., the line ends ταῦ, <τὸ> ὖ), IG22.2783.4 (iv B. C.), Hellad. ap. Phot.Bibl.p.530 B.; τό τ' ὖ or τό θ' ὗ might be read in Achae.33.3 for τοῦ ῡ codd.Ath.; later τὸ υ ψιλόν or τὸ ψιλὸν υ (as name of the first letter of ὕαλος, υἱός, etc.), Theognost.Can.18, Sch. Ar.Pl.896, Ps. Hdn.Epim.116, 137, al.: so named to distinguish it from ἡ οῑ δίφθογγος, υ and οι being pronounced alike in late Gr.; is aspirated in AP9.385.20 (Steph.Gramm.), 11.67.1 (Myrin.) cod.Pal.; the Coptic name

   A he (cf. Arm. hiun) may indicate that the early name was , which seems also to be implied by Verg.A.1.744: alii dicunt Hyadas dictas vel ab Y littera, vel ἀπὸ τοῦ ὑός, cf. Sch.Il.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.