Just see it for the last time because after reading further you’ll never see it this way ever again.
See the symbol once again. Do you see an ‘I’ and ‘O’ sign?
Does this broken circle with a line inside it look like 1 and 0?
The story of this symbol goes far back to World War 2 when engineers used the binary system to label power button.
In binary systems, 1 means “on” and 0 mean “off.”
Finally in 1973, it was standardized by International Electrotechnical Commission, IEC as a power button symbol.
You may have seen these power button too. Here we have to toggle between on and off, that’s why – there are different I and O.
Whereas these kind of buttons work for both On and Off, that’s why this symbol.
IEC 5007, the power on symbol (line), appearing on a button or one end of a toggle switch indicates that the control places the equipment into a fully powered state. It comes from the binary system (“1” means “on”).
IEC 5008, the power off symbol (circle) on a button or toggle, indicates that using the control will disconnect power to the device. It comes from the binary system (“0” means “off”).
IEC 5009, the standby symbol (line partially within a broken circle), indicates a sleep mode or low power state. The switch does not fully disconnect the device from its power supply. This may appear on a toggle switch opposite a power on symbol, alone on a push-button that places the device into a standby state, or alone on a button that switches between on and standby. Alternatively, under IEEE 1621, this symbol simply means “Power”.
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