The term POLE ON A SAILBOAT is a four-letter word, MAST. A MAST is a vertical pole that supports the sails of a sailboat. It is typically made of wood or aluminum and is held in place by rigging. The MAST also serves as a point of attachment for other parts of the boat, such as the boom and the gaff. The MAST is an essential part of a sailboat, providing stability and allowing the sails to be raised and lowered.