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Coloured dots in a margin checking ink registration.
Also known as: Colour check dots, Ink registration dots, Colour dabs marking
In philately a traffic light is a row of coloured dots printed in a sheet margin, one for each ink used, allowing the printer to check that every colour was applied.
Shows one dot per ink used, letting a printer confirm that every colour reached the sheet.
Contexts: History
Is named for its resemblance to a signal rather than for any connection with traffic, which is a source of confusion in indexes.
Contexts: History
A row of small solid circles printed in the sheet margin, one in each ink colour used for the stamps.
A fuller structured visual breakdown is not yet documented for this symbol.