Outrigger
I believe it is called a "spar".
Since the definition of spar is a pole that supports the sail of a ship or boat, the antonyms of spar are the antonyms of the synonyms of spar. Some synonyms are rod, rail, and varnish.
1-During the case, the judge directed lawyers not to spar with each other in court. 2-It is natural for boys to spar with their friends over girls they like. 3-The rough weather broke the sailing boat's spar and it had to be rescued by the lifeboat.
a rock sticking up (or projecting) out of the ground is called an outcrop.
It is a spar. Though it is usually called a health spar, to differentiate it from a spar in the rigging on a ship, or a spar town (the spar town of Bath, England is one example).
A plane, or any of a number of planes, projecting from the hull of a submarine boat, which by being elevated or depressed cause the boat, when going ahead, to sink or rise, after the manner of an aëroplane. 2. A projecting plane or fin on a gliding boat to lift the moving boat on top of the water; also, a gliding boat. Of a boat, to plane (see Plane, below).
This is called a "strut" or "spar".
It is called a spout
Spar
Pinna.the
It is called a spout