An acoustic buoy is a specialized type of buoy that is designed to detect underwater activity, like the sound waves produced by ocean creatures. There are many different terms used to describe this type of buoy, including hydrophone, sonobuoy, and acoustic sensor. Each of these terms has its own subtle nuances and specialized meanings, and may be used in different contexts depending on the specific applications involved. Other synonyms for an acoustic buoy might include underwater microphone, sonar detector, or acoustic beacon. Regardless of the terminology used, the function of an acoustic buoy remains the same: to help scientists and researchers gain a deeper understanding of the ocean and the creatures that call it home.