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A vertical line inside an unbroken circle — IEC 60417-5010, marking a button that switches equipment between fully on and fully off.
Also known as: Power on/off toggle symbol, IEC 60417-5010
IEC 60417-5010 is the symbol for a single control that toggles between fully on and fully off. It is visually almost identical to the standby symbol (IEC 60417-5009); the distinguishing feature is that this circle is closed and the line sits inside it.
Marks a button that switches equipment between a fully on and a fully off state, as distinct from the standby symbol's low-power state.
Contexts: Electrical equipment
An unbroken circle with a short vertical line inside it, not touching the circle's edge. The closed circle is what distinguishes it from the standby symbol.
Near-identical: a closed circle means a true on/off toggle, a broken circle means standby. Only the second actually disconnects nothing.
Both belong to the IEC 60417 equipment markings system.