Dog whistle

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A dog whistle (also known as silent whistle or Galton's whistle) is a type of whistle that emits sound in the ultrasonic range, which humans cannot hear but some animals can, including dogs and domestic cats, and is used in their training.

Excerpt from the Wikipedia article “Dog whistle”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Sebastian Hartlaub, CC BY-SA 3.0, via Wikimedia Commons.