Klaxon Mayday Roman candle SOS aid to navigation air-raid alarm alarm alarm bell alarm clock alarm signal alarum alert all clear amber light balefire beacon beacon fire bell bell buoy blinker blinking light blue peter buoy burglar alarm buzzer caution light crostarie fiery cross fire alarm fire bell fire flag five-minute gun flare flashing light fog bell fog signal fog whistle foghorn gale warning glance go light gong buoy green light heliograph high sign hooter horn hue and cry hurricane warning international alphabet flag international numeral pennant kick leer lighthouse marker beacon nod note of alarm nudge occulting light parachute flare pilot flag poke quarantine flag radio beacon red flag red light rocket sailing aid semaphore semaphore flag semaphore telegraph sign signal signal beacon signal bell signal fire signal flag signal gong signal gun signal lamp signal light signal mast signal of distress signal post signal rocket signal shot signal siren signal tower siren small-craft warning spar buoy still alarm stop light storm cone storm flag storm warning the nod the wink tocsin touch traffic light traffic signal two-minute gun upside-down flag watch fire whistle white flag wigwag wigwag flag wink yellow flag