An escutcheon is a shield with a particular family’s coat of arms on it. Long ago, knights carried escutcheons into battle.
Escutcheon comes from the Old French escusson, which was both a “half-crown coin” and also a “coat of arms,” from a Latin root meaning “shield.” An escutcheon can be an actual shield, held as defense from an opponent’s sword, or the shape of a shield, especially when it’s part of a coat of arms. A more modern meaning of this word is “flat metal around a keyhole,” a piece of hardware with a vaguely shield-like shape.
a shield; especially one displaying a coat of arms
a flat protective covering (on a door or wall etc) to prevent soiling by dirty fingers
(nautical) a plate on a ship’s stern on which the name is inscribed