acoustic buoy

1. A buoy that can be heard (at night) (synset 107281147)
   is a type of: buoy - bright-colored; a float attached by rope to the seabed to mark channels in a harbor or underwater hazards
   subtypes:

   • bell buoy, gong buoy - a buoy with a bell on it
   • whistle buoy, whistling buoy - a buoy that makes a whistling noise

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