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Written by rk: could be an enum on 2025-01-11 at 06:17

@markgritter

Actually, I bet it goes back to BNF. Backus used “or” in his metalanguage for syntax, but when Naur et al adapted it for Algol 60, they used | for or. Maybe that’s it?

Now of course, where Naur got the idea is up for grabs.

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