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?
I think the point is that the physicists were among the very early adopters of computing systems. I’m not sure about the history of the term “code” used this way, but it might literally predate compiled software since Ulam and von Neumann invented the Monte Carlo method in 1948 during the Manhattan Project.
Personally I think it just sounds outdated now, but it’s pretty common to hear people call their software “a hydrodynamics code” or “a molecular dynamics code”