On-off switch

From International Dictionary of Marine Aids to Navigation
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A device designed to make or break an electric circuit by means of separable mechanical contacts having two positions of rest, one corresponding to the open-circuit condition and the other to the closed-circuit condition.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM