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!
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The International Electrotechnical Commission standards organization define it as open/closed as many others have stated.
The line is on. The circle is off.
Yes, the numbers 0 and 1 are used for on off sometimes , but the symbol is a line abd circle and they were originally chosen as a language neutral representation for an open and closed circuit.
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