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character, <of a light signal>
characteristic, <of a light signal>
distinctive rhythm and colour, or colours, of a light signal that provide the identification or a message
Note 1 to entry: This entry was numbered 845-11-08 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-133 and 17-137 in CIE S 017:2011.