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light signal
Note 1 to entry: A light signal can be a reflected image of the light source, for example the use of heliographs.
Note 2 to entry: The term "light signal" is sometimes used for an object or apparatus that emits a light signal, but this usage is not recommended (see "signal light").
Note 3 to entry: This entry was numbered 845-11-02 in IEC 60050-845:1987.