Bollard

A bollard is a short vertical post. Originally it only meant a post used on a quay for mooring

A bollard, a name inherited from the Norman-French name Boulard still often found in Normandy, is a short wooden, iron or stone post used on a quayside for mooring ships. Mooring bollards are seldom exactly cylindrical, but typically have a larger diameter near the top to discourage mooring warps (docklines) from coming loose. Single bollards sometimes include a cross rod to allow the mooring to be bent into a figure eight.