The numerical version of this sin is

    typedef float real;

which promotes a similar confusion of concepts, even if the true meaning is understood by experts.

That said, I think the QM/not QM lingo from the molecular dynamics community is considerably worse because it stokes a common misunderstanding: that the universe runs on classical mechanics except in lasers, particle accelerators, and other "exotic circumstances." By contrast, nobody thinks that the universe runs on float32s except in lasers and spaceships where it runs on float64s. Where confusion does not exist, we do not need to fight it, but where it does, we should probably try.