From International Dictionary of Marine Aids to Navigation
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An object, or pair of objects, of characteristic shape and colour, that is carried on top of a buoy as a means of identification.


For details of topmarks used in the IALA Maritime Buoyage System, see Chapter 2 (Rev).

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