What Is a Power Button and What Are the On/Off Symbols?

A power button turns an electronic device on or off. A hard power button visually indicates when something is on or off, unlike a soft power button.

Power on button icon. Black button power.

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Where did the power button logo come from, and how did it become so universal? - Quora

Power button design meaning : r/Damnthatsinteresting

Turns out the Power symbol has an awesome secret meaning

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Why are the symbols (I /O) used for on and off in many electronics? The I and O are just examples for the “line” and “circle” I usually see. - Quora

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