The proper term for a post on a ship is a "Stanchion".

Stanchion is a type of post that provides support for structures or objects and keep them upright. They can be seen holding up car head rests, holding up goal posts in soccer or on bicycles.

The velvet rope is hooked onto something called a stanchion.

A stanchion is used to hold a cow still while giving her shots, oral medicines, simple medical procedures, or milking. There are different types for different purposes. A simple head gate is usually used for milking while a full body squeeze chute is used for medical treatments and procedures.

The telephone pole may exist as a light stanchion. There are no land-line telephones in Antarctica, even on the US bases.