A vertical bar (|) — IEC 60417-5007, marking the control position that places equipment into a fully powered state.
Also known as: Power on symbol, IEC 60417-5007, Line symbol on a switch
The vertical bar of the classic |/O switch pair. IEC 60417-5007 indicates that the control places the equipment into a fully powered state; the shape derives from the binary digit 1.
Indicates that the control places the equipment into a fully powered state. Conventionally paired with the circle (power off) on a rocker or toggle switch, echoing binary 1 and 0.
Contexts: Electrical equipment
The IEC 60417 symbol set appeared in the 1973 edition of the standard (then IEC 417), with the symbols in informal use before that.
1973 onwards
A single upright vertical bar, like the digit one, with nothing enclosing it.
Both belong to the IEC 60417 equipment markings system.
The two halves of the conventional |/O switch marking: the bar means on, the circle means off.