Alternative term: Right angle reflector
A reflector consisting of two flat surfaces intersecting mutually at right angles. Incident waves entering the aperture so formed with a direction of incidence perpendicular to the edge, are returned parallel to their direction of incidence.
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