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Anyone know, or have a guess, what RBS stands for? I'm not finding it in the article or library.

I'm seeing the type annotations being referred to as "signatures" in a couple of places. (R)u(B)y (S)ignatures seems like a reasonable guess.

That would be correct.

.rb is a ruby file, so it's more what the s stands for

Signature. The Ruby::RBS library used to be called Ruby::Signature.