Conical Buoy (G.B.)
Nun Buoy (U.S.A.)
A buoy of which the upper part of the body (above the waterline), or the larger part of the superstructure, has approximately the shape of a cone with vertex upwards.
Note: In France, a conical buoy of which the lower part of the body (mainly below the waterline) is of spherical shape is also known as a Bouee Sphero-Conique.
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