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 think it has to do with the male/female terms found in the electronics/electrician trade. My grandfather was a union electrician by trade, and he taught me a lot. My father worked on circuit boards. He also taught me a lot. This being said…although these terms might be outdated, they refer to certain part of their respected trades as male and female. INPUT/OUTPUT
Your question, brings back to me a weird convo with my grandfather, when he was trying to explain to me why the outlet wasn’t working. He said something along the lines that the male was ready to go, but the female, wouldn’t put out. He thought this was hilarious. But that’s how I remember I/O.

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