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The vertical pole on a sailboat is called the mast, but at the bottom of the sail is horizontal pole called a boom. On the Tall Ships, the horizontal pole AT THE TOP of the sail is called the yardarm.
The vertical post is the mast, and the horizontal post is the spar. Both are required.
The vertical pole is the mast and the horizontal pole is the spar. Unless you are referring to a Polish sailor.
I believe it is called a "spar".
mast-a vertical spar to support sails on a ship
any object by which you can navigate I.e. a star Spar Sprit Mast
pole, post, spar
The vertical post to which a sail is attached is known as a mast. However, on the historical tall ships, the sail is attached to a horizontal beam known as a spar or boom. Some might say that the wind holds a sail. Or perhaps you are referring to the piece of rope (or line) that controls a particular sail. Please be more specifical.
check this website out http://thesaurus.reference.com/browse/mast Spar is a Greek word for mast of a ship.
spar
Any stick-like protrusion, but usually refers to the mast and boom.
Used as a verb, it can mean to fight in practice (I'm going to spar with my boxing trainer) As a noun, a part of the mast and rigging of a sailing ship that holds the sails (During the storm, the wind broke a spar.)