Stabilizing pendulum

From International Dictionary of Marine Aids to Navigation
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A device intended to reduce tilting of the optical system of a floating body such as a light vessel, light float or large navigation buoy, when the body moves under the action of waves or currents. The optical system is mounted on a pendulum inside the lantern.

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