Bandwidth characteristic (of the whole or part of a radio transmitter)
The variation of the output power with respect to frequency, the transmitter having been adjusted for operation on a specified frequency, and the frequency variation normally being only a small percentage of the specified frequency.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Centre of buoyancy
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM