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cardinal light
cardinal mark
signal light used to indicate, with reference to the cardinal points of the compass, where navigable water can be found
Note 1 to entry: This entry was numbered 845-11-42 and 845-11-43 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-122 and 17-123 in CIE S 017:2011.