A full rigged ship or fully rigged ship is a sailing vessel with three or more masts, all of them square rigged. A full rigged ship is said to have a ship rig. Sometimes such a vessel will merely be called a ship, particularly in 18th to early 19th century and earlier usage, to distinguish it from other vessels such as schooners, barques, barquentines, brigs, et cetera. Alternately, a full rigged ship may be referred to by its function instead, as in collier or frigate, rather than being called a ship. In many languages the word frigate or frigate rig refers to a full-rigged ship