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An ultrasonic whistle was a device that produced sounds above the normal range of Human hearing.
In 27 ABY, Viqi Shesh used an ultrasonic whistle to activate a Yuuzhan Vong device that, on receiving the ultrasonic signal, would dispense a cloud of sleep-inducing spores into the apartment of her targets, the Solo family.
- The New Jedi Order: Star by Star (First mentioned)