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  2. Whistling - Wikipedia

    en.wikipedia.org/wiki/Whistling

    An offstage whistle audible to the audience in the middle of a performance might also be considered bad luck. Transcendental whistling ( chángxiào 長嘯) was an ancient Chinese Daoist technique of resounding breath yoga, and skillful whistlers supposedly could summon supernatural beings, wild animals, and weather phenomena.

  3. Physics of whistles - Wikipedia

    en.wikipedia.org/wiki/Physics_of_whistles

    A trailing edge tone occurs when an exterior flow passes over a trailing edge. There is a whistle that is a combination of an edge tone and a trailing-edge tone and might be called a wake-edge tone. It occurs in rotating circular saws under idling conditions and may be called the circular-saw whistle. Under load conditions, blade vibration ...

  4. What is whistle training for dogs? - AOL

    www.aol.com/whistle-training-dogs-101500597.html

    Whistle training is a form of training that some dog parents swear by, but maybe you’re worried that the sound might hurt your dog’s ears, or that it won’t be effective enough – there are ...

  5. Whistled language - Wikipedia

    en.wikipedia.org/wiki/Whistled_language

    Whistled languages are linguistic systems that use whistling as a form of speech and facilitate communication between individuals. More than 80 languages have been found to practice various degrees of whistling, most of them in rugged topography or dense forests, where whistling expands the area of communication while movement to carry messages is challenging. [1]

  6. Steam whistle - Wikipedia

    en.wikipedia.org/wiki/Steam_whistle

    This whistle is the reason for the typical "long high - short low - short high" signal sound of steam locomotives in Germany. [18] Chime whistle – two or more resonant bells or chambers that sound simultaneously. In America, railway steam whistles were typically compact chime whistles with more than one whistle contained within, creating a chord.

  7. Hand flute - Wikipedia

    en.wikipedia.org/wiki/Hand_flute

    It is also called a hand ocarina or hand whistle. To produce sound, the player creates a chamber of air with their hands, into which they blow air via an opening at the thumbs. To produce sound, the player creates a chamber of air with their hands, into which they blow air via an opening at the thumbs.

  8. Add or disable 2-step verification for extra security - AOL Help

    help.aol.com/articles/2-step-verification...

    Enable 2-step for authenticator app. Important - You may not see this option as it yet available for all accounts. 1. Sign in to your Account Security page. 2. Next to "2-Step Verification," click Turn on 2SV. 3. Click Get started. 4. Select Authenticator app for your 2-step verification method.

  9. Shepherd's whistle - Wikipedia

    en.wikipedia.org/wiki/Shepherd's_whistle

    The size of the whistle can vary to fit the mouth of the whistler. The whistle's shape is best described as a flat circle of material, folded in half on a center line. This forms a very narrow U-shape in cross-section. The open space between the two sides is quite narrow - approximately 4–5 mm.