Code wheel

From International Dictionary of Marine Aids to Navigation
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A disc (forming part of a coder) on which a character is defined. This is transmitted by mechanical or other means to another apparatus (e.g. a light, radio emitter or sound signal).

Note: When the character is transmitted mechanically by action of a toothed or recessed disc on a lever, the term cam (properly applicable to the teeth) is sometimes used loosely for the code wheel.

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

acceleration due to gravity (m/s2)

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