foghorn

noun foghorn

• alarm — Alarm is a feeling of fear or anxiety that something unpleasant or dangerous might happen.
• siren — Classical Mythology. one of several sea nymphs, part woman and part bird, who lure mariners to destruction by their seductive singing.
• signal — anything that serves to indicate, warn, direct, command, or the like, as a light, a gesture, an act, etc.: a traffic signal; a signal to leave.
• horn — Cape. Cape Horn.
• klaxon — a loud electric horn, formerly used on automobiles, trucks, etc., and now often used as a warning signal.