Octahedral cluster

From International Dictionary of Marine Aids to Navigation
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An arrangement of eight corner reflectors with common faces designed to give a substantially uniform response in all directions. The octahedral cluster is formed by mounting three rectangular plates mutually at right angles, the geometric centres of the plates being coincident.

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