It historically stands for computer RPG. Because back in the days of the first role playing games transferred to computers calculating the dice roles, damages and other attributes. It was the distinction to tabletop games. Nowadays there are so many RPGs that I find the distinction lacking. The better term now would be classic RPG, because there are many computer action adventure RPGs, whereas the tabletop approach digitalised, like bg3, RPGs refer to the initial or, in better terms, classical RPGs.

In game science studies it is taught as classic RPG, in contrast to the more “modern” RPGs like Mass Effect or The Witcher.