episemon

Century Dictionary and Cyclopedia

1. n. In Greek antiquity, a device or badge, corresponding to the crest of later times, as that borne on the shield of a soldier, or that chosen as its distinguishing mark by a city, etc.
2. n. In the Greek alphabet, one of three obsolete letters used only as numerals. They are #2, a form of the digamma, #567, βαυ%148, vau (a similar character being used, later, as a ligature for ςτ, στ, and called stigma); #3, κόππα, koppa; and #5, σάν, san, later called σάμπι or σαμπι%148, sampi. As numerals they were written with a mark over them: thus, #2/ = 6, #3/ = 90, #5/ = 900. See vau, koppa, san, sampi.

Wiktionary

1. n. an insignia or some other distinguishing symbol
2. n. another name for the Greek letter digamma
3. n. a term for the digamma, koppa, or sampi as a Greek numeral sign