Alternative term: (Cargo) boom
A spar projecting from a mast, gantry, tripod or other supporting structure, and fitted with topping lift, slewing guys and lifting tackle.
In Germany, the term Schwergutbaum is used for derricks of more than 10 tons load.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM