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Power on (I) symbol: a single short vertical line
IEC 60417-5007
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Power on (I)

A single short vertical line. · also called “I symbol”, “mains on”, “on”, “power on”, “switch on”

What the Power on (I) symbol means

Switch position: on (connected to the mains)

On a power switch the position or side marked I is on: the device is connected to the mains. The opposite position is marked with a circle (O) for off.

Source · Official website Epson projector documentation: list of safety symbols on the equipment · checked

Where it appears

Device controls
  • IEC 60417
    —This meaning

Questions about the Power on (I) symbol

What does the Power on (I) symbol mean?
On a power switch the position or side marked I is on: the device is connected to the mains. The opposite position is marked with a circle (O) for off.
What does the Power on (I) symbol look like?
A single short vertical line. It is also called “I symbol”, “mains on”, “on”, “power on” and “switch on”.
Which standard defines the Power on (I) symbol?
It is listed as IEC 60417-5007.

Checked against the source · · How we verify

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