What is that Plus Sign with the Circle Around it on my Phone?

The line symbol means “power on” and the circle symbol means “power off”. The presence of both (I/O) on a push button means the switch toggles the power.

Isn't it from circuit diagrams? The line means it's connected and the o means it's open.

The symbol is a line abd circle and they were originally chosen as a language neutral representation for an open and closed circuit.

If you must have a non language based symbol, I think + for on and – for off is much easier to remember and would work much better. I can't imagine anyone of ...

The circle is “zero” (0), representing the “off” binary state, and the vertical line is a “one” (1), representing the “on” binary state. A ...

An easy way to remember what the circle and line mean is to think of it as a 1 and 0. Recall your computer science, logic, electrical engineering, whatever ...

⭘. IEC 60417-5008, the power-off symbol (circle) on a button or toggle, indicates that using the control will disconnect power to the device. (0 or ◯ means off.).

On/Off Markings To meet the standard IEC 60417, the symbol for ON is “I” (a straight line) and the symbol for OFF is “O” (a circle) . It is important to check the appropriate equipment standard for instructions regarding the position of “on” as som

The power off (circle) symbol or “O” on a button or toggle, indicates that using that control will disconnect power to the device. The power on ...