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

Introduced as early as the 1950s, and it’s because computing at a very basic level is handled in binary code – 1s and 0s. In this case, 1 represents on and 0 represents off.

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