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IEC 5007, the power on (line) symbol, appearing on a button or one end of a toggle switch indicates that the control places the equipment into a fully powered state. It comes from the binary system (1 or | means on). |
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IEC 5008, the power off (circle) symbol on a button or toggle, indicates that using the control will disconnect power to the device. It comes from the binary system (0 means off). |
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IEC 5010, the power on-off symbol (line within a circle), is used on buttons that switch a device between on and fully off states. |
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IEC 5009, the standby symbol (line partially within a broken circle), indicates a sleep mode or low power state. The switch does not fully disconnect the device from its power supply. This may appear on a toggle switch opposite a power on symbol, alone on a pushbutton that places the device into a standby state, or alone on a button that switches between on and standby. Alternatively, under IEEE1621, this symbol simply means "power".[2] |
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A crescent moon, indicating sleep, is added by IEEE 1621 as a replacement for the standby symbol. |
