RPM, which stands for Real Plus-Minus, is a stat that combines box score data with plus-minus to rank players
Player Impact Plus-Minus (PIPM for short) is a plus-minus impact metric that combines luck-adjusted plus-minus data with the value of the boxscore and a handful of interaction terms to estimate a player's value over the course of a season.
Dang. Just my personal opinion (not mod speaking), but if you bring up something that someone isn't familiar with, isn't "just google them" kind of a snarky response? In all honesty, I was about to ask the same thing bt then I realized I really don't care.