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by bra4you 2366 days ago
https://en.wikipedia.org/wiki/Plankalk%C3%BCl
1 comments

Even in German, appears the term was closer to "formal system", not "programming language".

"Kalkül is the German term for a formal system—as in Hilbert-Kalkül, the original name for the Hilbert-style deduction system—so Plankalkül refers to a formal system for planning.[2]"

Kalkül is calculus. (E.g. Lambda-Kalkül)
A calculus is a formal system.