From International Dictionary of Marine Aids to Navigation
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A device which, in a rhythmic light, interrupts the supply of energy (in the form of fuel or electric current) to a light source, according to the character of the light.

Note: A flasher is a form of coder.

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