"Siren (alarm)" . "car sirens" . . "Siren" . "rotary sirens" . "Sirens" . . "mechanical siren" . "warning sound" . "air raid siren" . . "alarm mechanism" . . "police siren" . "siren (alarm)" . "fire siren" . "syren" . "Siren (alarm)" . "sirens" . . "fire sirens" . "siren" .