Electrical Ground Symbol
Schematic symbol representing an electrical connection to earth ground.
International · c. 1900 – present
Power Symbol (IEC 5009)
Standardized symbol for power on/off controls on electronic devices.
Description
The power symbol consists of a circle with a vertical line at the top, combining the binary digits 1 (on) and 0 (off). It was standardized by IEC 60417 as symbol 5009 (standby) and 5010 (on). The symbol is used on power buttons, switches, and controls on electronic devices worldwide. The IEEE 1621 standard further defines the use of power symbols for consumer electronics. The symbol is so universally recognized that it was added to Unicode in 2015 (U+23FB–U+23FE) and became part of the Miscellaneous Technical block.
Origin & Cultural Context
Standardized by IEC 60417 (symbol 5009/5010). Added to Unicode 9.0 in 2016.