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Episēmon (Greek ἐπίσημον, from epi- "on" plus sēma "sign"; plural: episēma) is a Greek word that can mean:

  • a distinguishing mark or symbol, also called parasēmon, especially in the following contexts:
    • an ensign or figurehead on an ancient ship
    • a characteristic symbol displayed on a shield, similar to a coat of arms
    • a characteristic symbol stamped on an ancient coin
  • another name for the Greek letter Digamma, the numeral sign for "6"
  • a generic term for all three Greek numeral signs (Digamma 6, Koppa 90, and Sampi 900) in the system of Greek numerals, or similar symbols in other scripts