What is another word for boat whistle?
Pronunciation: [bˈə͡ʊt wˈɪsə͡l] (IPA) 
A boat whistle is a device used to signal the presence of a vessel. It emits a loud, high-pitched sound that is recognizable from a distance. However, there are many synonyms for the term "boat whistle" that can be utilized instead. Some of these synonyms include marine horn, ship whistle, boat horn, boat signal, foghorn, and siren. Each of these terms implies a different type of sound or function for the device, but all serve the same purpose of alerting other vessels to the presence of the boat. Regardless of which synonym is used, having a boat whistle on board is an essential safety measure for any vessel.
