Power on Symbol

Power on Symbol at U+23FD is a technical pictogram for switching a device on, represented by the vertical-line part of the standardized power-control family. It is in the Miscellaneous Technical block, alongside other interface and equipment symbols used in manuals, labels, and user interfaces. Its main real-world use is on physical buttons, printed instructions, and appliance documentation where a distinct “on” state must be shown without relying on words. It may appear near a rocker switch, circuit breaker, lab instrument, server, monitor, or audio device to mark the side or control position that energizes the equipment. The symbol is also used in software icon sets and technical diagrams when documenting hardware controls, especially together with the related off and standby symbols. In practice, many products use the more familiar combined power button icon for on/off toggles, so this standalone on symbol is most useful when the interface distinguishes separate on and off positions.