Ah, the ubiquitous standby / power symbol. Most early power controls used switches that toggled between two on and off. With widespread technological advances, and to bypass language barriers, these words were replaced with the universal symbols line “|” for “on” and circle “◯” for “off” (typically without serifs). This standard is still used on toggle power switches.
“The symbol for the standby button was created by superimposing the symbols “|” and “◯,” however, it’s commonly interpreted as the numerals “0” and “1” (binary code). Yet, the International Electrotechnical Commission (IEC) holds these symbols as a graphical representation of a line and a circle.” From Wikipedia.
Don’t be wedded to the idea of including one in your next logo project. This is just a small sampling of designs that already exist.
HiWired, Inc. (thanks M.)
GameVicio (thanks Lucas)
Digital Peach (thanks Brandon)
Com On (thanks Bernard)
Power of One (thanks David)