whistle signals
Referee's shrill directions
Whistle signals are coded messages conveyed through patterns of whistle blasts, used where voice communication is impractical.
Referees use whistle signals to start, stop, or penalize during games.
Train conductors signal departures and warnings.
Hikers and rescue teams use standardized patterns—three blasts typically means distress.
The lifeguard's whistle signal cleared the pool.
- refereeSports rule enforcer
- trainRail vehicle or instruct
- train conductorRailroad passenger attendant
- shrillHigh-pitched and harsh
- blastSudden forceful burst
alert · tweet · piercing · coach · blow · attention · attention getter · stop · warning · pitch · sharp · emergency · command · bird · kettle · lips · halt · trilling
whistle signalsvoice commands
Spoken orders to technology
hand signals · flag signals · text messages · speech · radio communication
whistle signalsdigital communication
Information exchange via technology
radio transmission · satellite communication · PA system · intercom
whistle, whistles, whistled, whistling, whistler, whistlers, signal, signals, signaled