A schooner sail is a type of sail configuration used on sailing vessels. It consists of two or more masts, with the foremast being shorter than the main mast. The JIB, which is three letters long, is a triangular sail set at the bow of the boat and is used to help steer the vessel. The spanker, which is seven letters long, is a four-sided sail set at the stern of the boat and is used to provide additional propulsion.