ταῦ

τ, τό
ταῦ, τό, the letter τ, Hp. VC 1, Pl. Cra. 394c, IG 22.2783.20 (iv B.C.), Sor. Fasc. 45, etc.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project