bollard

noun2

1. •
   A strong vertical post of timber or iron, fixed to a wharf, dock, or the deck of a ship, to which the ship's mooring lines or towlines are secured.

   • Today he had for bollard the unfinished monument half-erected to some all but forgotten anarchist. — 1959
2. •
   A similar post preventing vehicle access to a pedestrian area, to delineate traffic lanes, or used for security purposes.