John Hancock OK Roman candle acceptance admission affirmance affirmation aid to navigation alarm allowance amber light approbation approval authentication authorization balefire beacon beacon fire bell bell buoy blinker blue peter buoy caution light certification charter confirmation consent countersignature dispensation endorsement flare fog bell fog signal fog whistle foghorn glance go light go-ahead gong buoy heliograph high sign imprimatur international alphabet flag international numeral pennant kick leave leer liberty license marker beacon nod notarization nudge okay parachute flare patent permission permission to enter pilot flag poke police whistle quarantine flag radio beacon ratification red flag red light release rocket rubber stamp sailing aid sanction seal semaphore semaphore flag semaphore telegraph sigil 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 signature signet spar buoy special permission stamp stamp of approval stop light stop-and-go light subscription the nod the wink ticket ticket of admission touch traffic light traffic signal validation visa vise vouchsafement waiver warrant watch fire white flag wigwag wigwag flag wink yellow flag