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

See I always thought it was Zero and One. 0 meant nothing or off, and 1 meant something or on. Apparently I have been wrong all these year.

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