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A mast is a long pole or spar that rises from the keel or deck of a ship. It supports the yards, booms, and rigging, which in turn hold the sails that propel the vessel. The principal mast on a sailing ship is called the mainmast. Masts can be made of wood or metal and are crucial components of a ship's rigging. In modern steam and motor ships, masts are still used for various purposes, including supporting hoists, carrying radio antennae, and displaying lights and signals. The term "captain's mast" refers to a disciplinary proceeding in a naval unit.1234

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