Dog whistle
An aerodynamic whistle (or call) is a simple aerophone, an instrument which produces sound from a stream of gas,
it is a type of whistle that emits sound in the ultrasonic range, which people cannot hear kind of like a
"s b d" silent but deadly
An aerodynamic whistle (or call) is a simple aerophone, an instrument which produces sound from a stream of gas,
it is a type of whistle that emits sound in the ultrasonic range, which people cannot hear kind of like a
"s b d" silent but deadly