WHY are the symbols for power on / off “|” and “◯”?

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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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Anonymous 0 Comments

I learned them as being one and zero. In binary 1 is true and 0 is false, so if you want to know whether the system is on, 1 means yes and 0 means no.

As other conments have shown here, though, there are other possible interpretations.

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