ui

Numeric keypad history: Originated from calculators and cash registers, with different layouts (e.g., 9-0 for calculators and 1-3 for phones) due to ergonomic choices, technological constraints, and user familiarity. Key innovations include Jean-Baptiste Schwilgué’s 1844 calculator, Felt’s Comptometer (1884), and Sundstrand’s 3×3 layout (1914). The evolution influenced phone designs, maintaining familiarity in modern devices. Keypad design reflects historical patterns and user preferences.

https://www.doc.cc/articles/a-brief-history-of-the-numeric-keypad