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Related to gong buoy: can buoy
gong buoy[′gäŋ ‚bȯi]
A buoy similar in construction to a bell buoy, but sounding a distinctive note because of the use of sets of gongs, each gong having a different tone.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.