You are describing the mast.
A mast
mast
mast
The vertical pole is the mast and the horizontal pole is the spar. Unless you are referring to a Polish sailor.
An upright pole on a ship to support sails or antennae.
Yes.
The mast.
Mast
The mast.
why cant it be pole.
The sternmost rigging pole on a ship is typically the mizzenmast. It is located at the aft or rear of the ship and is used to support the mizzen sail.