bollard

noun

1. Nautical.
   1. a thick, low post, usually of iron or steel, mounted on a wharf or the like, to which mooring lines from vessels are attached.
   2. a small post to which lines are attached.
   3. bitt(def 1).
2. British. one of a series of short posts for excluding or diverting motor vehicles from a road, lawn, or the like.

noun

1. a strong wooden or metal post mounted on a wharf, quay, etc, used for securing mooring lines
2. British a small post or marker placed on a kerb or traffic island to make it conspicuous to motorists
3. mountaineering an outcrop of rock or pillar of ice that may be used to belay a rope