You see this symbol everywhere. I can even say that is the most popular symbol being used in this century. Everyday, you switch on and off your mobile, TV, Laptop, Microwave oven, washing machine, or any other electrical or electronic appliance and see this symbol on the power button.

But I’m sure you’ve never wondered what this symbol mean? Is there any logic behind the design of this symbol? Wanna know about it?

Trust me, the logic behind the design of this power button symbol is very interesting, and you’ll never see the symbol this way ever again.

So, let’s find out.

Just see it for the last time because after reading further you’ll never see it this way ever again.

Just see it for the last time because after reading further you'll never see it this way ever again.This is the last time you’re seeing the power button symbol this way.

See the symbol once again. Do you see an ‘I’ and ‘O’ sign?

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?

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.

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.”

In binary systems, 1 means
 

Finally in 1973, it was standardized by International Electrotechnical Commission, IEC as a power button symbol.

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.

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.

Whereas these kind of buttons work for both On and Off, that's why this symbol.
 

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