Bollard 4 : A steel post or posts anchored to the pier to which ship mooring lines are secured. Double bollards are sometimes angled away from each other
Association of Marine Underwriters of San Francisco (AMUSF), Glossary of Marine Insurance and Shipping Terms, http://www.amusf.com/Definitions_A.htm, CA, USA 2011. (Mrtm Insur and Shipping - Amer) {575}