steam whistle

Pressure-release alarm device

A steam whistle is a signaling device that produces a loud tone when pressurized steam is forced through it.

Used on locomotives, ships, and factories to announce arrivals, departures, or shift changes: The factory steam whistle blew at five o'clock.

The sound became iconic of industrial-age transportation and labor.

Opposites
sound production mechanism

steam whistlehand bell

Handheld percussion instrument

air horn · bell

audibility/volume

steam whistlesilence

Total lack of sound

visual signal · silent alarm · mute · flashing light · light signal

technological era

steam whistlewireless alert

Cordless signal or notice

GPS beacon · satellite signal · app notification · push notification

Family

steam, whistle, steaming, whistling, steamer, whistler

Familiarity
Top 100,000
Profile
Known to kids · Used worldwide · Timeless · Concrete · Everyday, not technical · Rated G