What are/were they meant to represent? When were they introduced? I can’t find any consistent reliable sources. I’d really appreciate references if anyone has any!
In: 27
There are a few sources on the internet that support the 1 means on and 0 means off theory.
* Stack Exchange gave [it 72 upvotes](https://ux.stackexchange.com/questions/81284/what-is-the-origin-of-the-power-icon)
* LGR has a YouTube (https://www.youtube.com/watch?v=VKCFDBPvJ74).
* [Wikipedia says:](https://en.wikipedia.org/wiki/Power_symbol)
>The well-known on/off power symbol was the result of the logicalevolution in user interface design. Originally, most early powercontrols consisted of switches that were toggled between two statesdemarcated by the words On and Off. As technology becamemore ubiquitous, these English words were replaced with the universalsymbols line “|” and circle “◯” (typically without serifs) to bypass language barriers.
Furthermore, those arguing that the 0 sign represents an open circuit should know that an open switch looks like ___/ _____ in a circuit diagram, like a broken line.
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