On a square rigged ship, the spanker is a gaff-rigged fore-and-aft sail set from, and aft of, the aftmost mast. Spankers are also called driver, jigger, and pusher sail.

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Overview

On a square rigged ship, the spanker is a gaff-rigged fore-and-aft sail set from, and aft of, the aftmost mast. Spankers are also called driver, jigger, and pusher sail.

From Wikipedia (CC BY-SA 4.0).