Mayday SOS air-raid alarm alarm alarm bell alarm clock alarm signal alarum alert all clear beacon blinking light boiler factory boiler room bull-roarer burglar alarm buzzer catcall cherry bomb clack clacker clapper cracker cricket crostarie fiery cross fire alarm fire bell fire flag firecracker five-minute gun flashing light fog bell fog signal foghorn gale warning hooter horn hue and cry hurricane warning lighthouse noisemaker note of alarm occulting light police whistle rattle rattlebox signal of distress siren small-craft warning snapper steam whistle still alarm storm cone storm flag storm warning ticktack tocsin two-minute gun upside-down flag whistle whizgig whizzer