What is an Octothorpe?
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Why do phones have the * and # buttons? (And why do they call the # button "pound?") - The Solid Signal Blog
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The Symbol on the “Pound” or “Number” Key (#) on a Telephone is Also Called An Octothorpe
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What is an Octothorpe?
Wine Spice ++: Tech Tip: Enter the Pound Sign
names - How to refer to that '#' button on the phone? - User Experience Stack Exchange
