From International Dictionary of Marine Aids to Navigation
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Alternative term: Reflex Reflector

A device intended to produce reflex reflection (2-1-155), at least for a limited range of angles of incidence of a light beam.

It may comprise one or more retro-reflecting optical units, for example, corner reflectors or special lens units of glass or plastic. Such devices may be installed generally on unlighted buoys or other navigational aids to increase the range at which they may be seen at night.

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