aid to navigation alarm amber light balefire beacon beacon fire bell bell buoy blinker blue peter bomb buoy cap caution light cherry bomb cracker firecracker flare flowerpot fog bell fog signal fog whistle foghorn girandole glance go light gong buoy green light heliograph high sign international alphabet flag international numeral pennant kick ladyfinger leer marker beacon nod nudge parachute flare pilot flag pinwheel poke police whistle quarantine flag radio beacon red flag red light rocket sailing aid semaphore semaphore flag semaphore telegraph serpent sign signal signal beacon signal bell signal fire signal flag signal gong signal gun signal lamp signal light signal mast signal post signal rocket signal shot signal siren signal tower skyrocket snake spar buoy sparkler squib stop light the nod the wink torpedo touch traffic light traffic signal watch fire white flag wigwag wigwag flag wink yellow flag