From International Dictionary of Marine Aids to Navigation
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An assembly of optically refracting or reflecting elements (or both) and their supporting frames.

Through the agency of these elements, rays emitted by a light source are deflected into new directions as required.

Ch2 Fig10.jpg

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