This means the numbers and values are expressed through only two digits: 0 and 1. The binary system is a base-2 number system in computer science and mathematics.
Utilized the Binary Systemĭuring World War II, engineers already used the internationally-recognized binary system to label power buttons and switches. That’s where the idea of using 0 (zero) and 1 (one) came from.
#On off symbols full#
When and why were the “ON” and “OFF” power symbols replaced with the vertical line and full circle? Do all manufacturers all over the world use these power switch symbols? On and Off Label during the World War IIĪround World War II (1939–45), most power switches were still labeled “ON” and “OFF.” Need to Create a Simpler Labelīut as the trade of electronic products started to become global and technology continued to advance, there was a need to create simpler and more compact labeling that non-English-speaking people could also understand. In the past, power switches had a lever or slider that you could push to the “ON” or “OFF” position. This symbol indicates their on-off states. Most modern electronic devices have a power button or switch marked by a vertical line (“I”) and a full circle (“O”) symbol at the top. Origin of the “I” and “O” Power Switch Symbols Read on to learn more about these I.E.C.-designated off/on switch symbols. The Institute of Electrical and Electronics Engineers (IEEE) added it to replace the standby mode symbol. Meanwhile, a crescent moon symbol means sleep mode. What do the “I” and “O” symbols mean? In this article, you’ll learn the origin and meaning of these power switch on/off symbols.Īccording to the International Electrotechnical Commission (I.E.C.) 60417-5010 standard, the on-off power symbol, a vertical line partially within a broken circle, toggles any device between on and off. You’ve probably seen the I/O on/off switch on many home appliances and gadgets and always got confused.
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