siren
loud noise-making device
wayside horn
audible signal used at level crossings
civil defense siren
audible signal for emergency population warning
J-Alert
Japanese disaster preparedness alert system
De la Tour's siren
early mechanical siren
directional siren
siren with a bandwidth broader than 500 Hz-1.8 kHz that enables listeners to more quickly locate the source of the sound
Rumbler siren
emergency vehicle siren