ἰῶτα

indecl., ι, τό
A. yôd) the letter ι, Pl. Cra. 418b, Aen. Tact.31.18, Call.Gramm. ap. Ath. 10.453d, etc.
2. line, stroke, on a sundial, Bull.Soc.Alex. 4.83 (iii B.C.).
3. prov., of anything very small, smallest letter, jot, Ev.Matt. 5.18.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project