Bailly
ου (τὸ) v. ἐπίσημος.
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LSJ
τό, distinguishing mark, device, badge, Hdt. 1.195; badge or bearing on a shield, v.l. in Id. 9.74; ensign or flag (or figurehead) of a ship, Id. 8.88, cf. Hp. Ep. 17; device on a coin, Plu. Thes. 6; on a signet, SIG 2588.3 (Delos, ii BC); serial number, PPetr. 3 p. 203 (iii BC); ἐπίσημα, τά, hieroglyphics, OGI 56.64 (Canopus, iii BC).
generally, mark, imprint, τῶν ὁπλῶν S. Ichn. 102.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)