flag signal alarm alert bell horn sign siren gong warning chime carillon knell buzzer hooter whistle cymbal klaxon toll peal indication mark doorbell clapper dinger curfew ringer buzz indicator glockenspiel pointer signification cry call drum trumpet flash blast alarum sensor beeper timer foghorn caution notice notification forewarning tip hint advice reveille lead clue cue idea dope information prompt forecast word nod steer news suggestion message whisper counsel caveat exhortation omen guidance premonition intimation reminder inkling recommendation admonition notion prompting guideline innuendo inference reference wink prod mnemonic admonishment goad nudge help spur feed jolt jog gesture twit stimulus maxim nap wrinkle