You are describing the mast.
The mast.
Its called a mast. hope i helped :)
On a sailing ship, possibly on the mast.
A mast.
On a sailing vessel having more than three mast, the mizzen mast is the third mast immediately aft of the main mast. It is a shorter mast than the foremast. It is often located over the stern of the boat or ship. Correction to the above: a "Yawl" or a "Ketch" has two masts -a mainmast and a mizzen, with the mizzen sometimes located right on the transom at the stern.
16'7".359
A backstay is a a part of the rigging of a sailing ship extending from masthead the top of the mast to the back of the ship.
If a sailing ship has two masts, and the aft is shorter than the fore mast, then the aft mast is called a mizzen mast. And it is in english.
The main mast was the tallest standing object on a sailing ship so the top of the main mast would be the highest point.
Hull, mast, sail, lines, anchor, lights, keel, galley
mast