Where did the at sign come from?

Where did our little friend, the @ symbol, come from? And why is it on computer keyboards today? It turns out, even if nobody had thought to use it in email, we'd probably still be seeing a @ character dropped in whenever we press shift+2. Why is that? Youtube channel Inkbox has a very thorough explanation, breaking down the history of the @ sign and how it came to be, long before SMTP. Check it out!

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