Reserve buoyancy

From International Dictionary of Marine Aids to Navigation
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The watertight volume of a vessel above the designed waterline, expressed as a percentage of the total buoyancy (volume). It is an indication of the seaworthiness of the vessel.

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