As technology became more ubiquitous, these English words were replaced with the symbols line | for on and circle ◯ for off (typically without serifs) to bypass language barriers. This standard is still used on toggle power switches, sometimes in th
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The symbols are based on the binary number system, where 1 represents on, and 0 represents off.. On and Off Symbols · Force a Computer to Turn Off · Shutting Down Without a...
The earliest binary switches were marked with an I and an O to denote, respectively, a closed electrical circuit (device on) and an open circuit (device off).