Earlier quoted context omitted.
> They call it "codes" They/We have probably been calling it that since before you were alive. I wouldn’t be surprised if it comes from the 60s or 70s. Every group of people has their own terminology for stuff. There is no right or wrong.
I have never heard or read anyone, beside physicists, say codes for software code. It doesn't even make sense. Where have you seen that used?
See for example Code_Aster (as in, "a code"), which is one of the largest projects for open source FEA (and it mostly rooted in academia).