Acrostolium

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An acrostolium (from Gk: akrostolion, ἀκροστόλιον, meaning "high dressing"; also called an aphlaston; ἄφλαστον) or aplustre are the Latin terms that have entered English for a decorative feature found on the sterns of ancient Roman, Greek and other nations' galleys, often as a fan- or tail-like flourish in the upward-curving extension of the ship's rear.