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.
A cue, warning, or alert; a sign or signal that something is wrong.
A signal that the race must be stopped immediately (and possibly restarted).
red rag
A common symbol, usually in the form of a banner, for leftist revolutionary ideologies, especially socialism.
In the United Kingdom and some other countries, a flag formerly used by a railway guard to warn the driver not to start the train.