ensign

noun

1. a flag or banner, as a military or naval standard used to indicate nationality.
2. a badge of office or authority, as heraldic arms.
3. a sign, token, or emblem: the dove, an ensign of peace.
4. U.S. Navy and Coast Guard. the lowest commissioned officer, ranking next below a lieutenant, junior grade, and equal to a second lieutenant in the Army.
5. Archaic. standard-bearer(def 1).

noun

1. (also ˈɛnsən) a flag flown by a ship, branch of the armed forces, etc, to indicate nationality, allegiance, etcSee also Red Ensign, White Ensign
2. any flag, standard, or banner
3. a standard-bearer
4. a symbol, token, or emblem; sign
5. (in the US Navy) a commissioned officer of the lowest rank
6. (in the British infantry) a colours bearer
7. (formerly in the British infantry) a commissioned officer of the lowest rank