S.I.G. is an acronym used in the television series Captain Scarlet And The Mysterons, it stands for "Spectrum Is Green", and has a similar use to "10-4" or "Roger".

An alternate is also used: S.I.R., which stands for "Spectrum Is Red"; it means "negative".

It can be likened to the term "F.A.B." in Thunderbirds and "10-10" in Terrahawks.

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