From International Dictionary of Marine Aids to Navigation
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A device comprising opaque strips, usually mounted so that each may be rotated through about 90 degrees on an axis.

All strips rotate simultaneously so as alternately to exhibit or obscure a light.

Ch2 Fig36.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