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Here’s the hidden meaning behind the Power button symbol:
All the power buttons are described in the International Electrotechnical Commission (IEC) 60417 standard. According to Wikipedia, universal numeric symbols 1 and 0 are used to bypass language barriers and these numeric standards are still used on toggle power switches.
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The power symbol came from, 0 (circle) which indicates power is Off and 1 (vertical line) stands for power On. In order to create a single symbol for both power On/Off, “0” and “1” symbols i.e circle and vertical line were merged and super-imposed on each other. This superimposed symbol is used presently and is recognized universally as the power button.
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