BOLLARD

n. strong vertical post made of wood or iron to which ropes or cables are secured on a boat or dock (Nautical)

A bollard is a short vertical post typically found where large ships dock. While originally it only meant a post[1] used on a quay for mooring, the word now also describes a variety of structures to control or direct road traffic. The term may be related to bole, meaning the lower trunk of a tree.
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Noun
1. a strong post (as on a wharf or quay or ship for attaching mooring lines); "the road was closed to vehicular traffic with bollards"
(synonym) bitt
(hypernym) post
(hyponym) riding bitt
(part-holonym) pier, wharf, wharfage, dock
(part-meronym) bitthead
(classification) ship

n. bollard

n. bollard