Is Circle On or Off? A circle symbolizes Power Off. Five important symbols show various Power modes. Usually, on multiple devices, the Power On symbol is “I” (a vertical line similar to the …

IEC 60417-5010, [9] the power on-off symbol (line within a circle), is used on buttons that switch a device between on and fully off states. A crescent moon, indicating sleep mode, is added by …

Aug 14, 2025 · 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.

Jun 25, 2024 · The circle and line symbol, often called the universal power symbol, shows whether a device is on and functioning (circle and line) or off and not powered (just the circle).

Most modern electronic devices have a power button or switch marked by a vertical line (“I”) and a full circle (“O”) symbol at the top. This symbol indicates their on-off states.

Jul 12, 2025 · Learn why 'I' means on and 'O' means off, and how to remember the difference.

The on/off symbols are used to indicate whether a device is turned on or off. The most common symbols are the circle and line symbol, which is used to indicate that the device is on and the …

Jan 19, 2024 · The power-off symbol, represented by I.E.C. 5008, is a circle without any line inside. When a toggle switch is flipped to the “O” side, it signifies that the device is completely …

Sep 12, 2025 · But have you ever stopped to think about the symbol that represents this concept? You know, the one that consists of a circle with a vertical line in the middle and a circle with a …

Aug 10, 2023 · A broken circle encompasses a vertical line, unified into one single icon. This combination indicates that pressing this button will toggle between on and off states.