What exactly do the I and O on the switch stand for ...

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 ...