An emergency signal sent by radio (or other means) from a ship or aircraft in distress or danger.
An indication of distress.
The sound or other warning made by a fire alarm.
An electromechanical or electronic bell, klaxon, chime, horn, speaker, strobe light or other device which warns people in a building of a possible fire or other condition requiring evacuation.
An emergency response to a fire by the fire department with manpower and equipment.