French or English for a metal, masonry or wooden post or vertical structure around which lines are turned to secure or moor a watercraft. In locks, they can be fixed or floating. Baulard, bitte, bitte d'amarrage, bollard, boulard or pieu in French.
Basically, a large bitt; except bollards were generally not cylindrical but smoothly tapered, small at the bottom, fat on top. Bollards were used with lines that had prepared eye splices at the end. This loop was simply slipped over the bollard. Titanic's deck bollards were used for lines passed to her from tugboats.
A bollard is a short vertical post. Bollards can be found where large ships dock. While originally it only meant a posthttp://www.etymonline.com/index.php?search=bollard&searchmode=none used on a quay for mooring, the word now also describes a variety of structures to control or direct road traffic.
A bollard is any object that is used to confine traffic within or from a given area. They are vertical members made of wood, steel or concrete which are permanently placed. See Barrier, Anti-Ram Vehicle Barrier, Passive Barriers.