A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a cathode-ray tube (CRT) display. Like a touchscreen, a light pen allows the user to point to displayed graphic elements such as menus or buttons, or even draw directly on the screen.
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a cathode-ray tube (CRT) display. Like a touchscreen, a light pen allows the user to point to displayed graphic elements such as menus or buttons, or even draw directly on the screen.
Source: Wikipedia "Light pen" · CC BY-SA 4.0
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