A standard traditional telephone keypad features two mandatory non-numeric symbols positioned alongside the numeric digits 0 through 9 in its twelve-button grid. In the bottom-left corner directly to the left of the zero digit sits the asterisk symbol (*), historically referred to as the star key. In the bottom-right corner directly to the right of the zero digit sits the pound sign (#), which is widely known internationally as the hash symbol or octothorpe. On modern smartphone virtual touch dialers, these symbols remain permanently integrated into the bottom corners of the numeric grid, allowing users to input access codes, interact with automated customer service routing menus, and execute special carrier commands.
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