Pound | Telephone Button - Britannica

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  • Alexander Graham Bell and the New York City–Chicago telephone link In telephone: Push-button dialing

    …bearing the star (*) and pound (#) symbols, to accommodate various data services and customer-controlled calling features. Each of the rows and columns is assigned a tone of a specific frequency, the columns having higher-frequency tones and the rows having tones of lower frequency. When a button is pushed, a…

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