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2. Foghorn - Wikipedia

   en.wikipedia.org/wiki/Foghorn

   Foghorn made with a marine shell, with a hole on its narrowest side An early form of fog signal: the fog bell at Fort Point Light Station, Maine. Audible fog signals have been used in one form or another for hundreds of years, initially simply seashell horns, fog bells or gongs struck manually.

3. Cleat (nautical) - Wikipedia

   en.wikipedia.org/wiki/Cleat_(nautical)

   A horn cleat is the traditional design, featuring two “horns” extending parallel to the deck or the axis of the spar, attached to a flat surface or a spar, and resembling an anvil. A cam cleat in which one or two spring-loaded cams pinch the rope, allowing the rope to be adjusted easily, and quickly released when under load.

4. Fog bell - Wikipedia

   en.wikipedia.org/wiki/Fog_bell

   Initially, small boats were fitted with bells and anchored. The first true bell buoy was developed in 1852 by Lieutenant Brown, who worked at the Lighthouse Establishment . He took a buoy and constructed a mount for the bell, under which he placed a plate with radial grooves on which a cannonball rolled and, moved by the swell, struck the bell ...

5. Vehicle horn - Wikipedia

   en.wikipedia.org/wiki/Vehicle_horn

   A horn is a sound-making device installed on motor vehicles, trains, boats, and other types of vehicles. The sound it makes usually resembles a “honk” (older vehicles) or a “beep” (modern vehicles). The driver uses the horn to warn others of the vehicle's presence or approach, or to call attention to some hazard.

6. Horn (acoustic) - Wikipedia

   en.wikipedia.org/wiki/Horn_(acoustic)

   A patent horn loudspeaker. Loudspeakers are often built into horn-shaped enclosures or use horns. Most often the higher-frequency elements (tweeters and midranges) use horns, sometimes with acoustic diffraction lenses to spread the sound waves in a horizontal pattern at ear-level and limit the vertical pattern. An audio driver (e.g., a speaker ...

7. International Code of Signals - Wikipedia

   en.wikipedia.org/wiki/International_Code_of_Signals

   [b] (often attached to the man overboard pole on boats). With a sinister hoist, the semaphore flag. P Papa [ˈpa.pə] The Blue Peter. In harbour: All persons should report on board as the vessel is about to proceed to sea. At sea: It may be used by fishing vessels to mean: "My nets have come fast upon an obstruction." Q Quebec [kəˈbɛk]