Rspm. My god now we can all talk about rpm's... Why? Because it is rpm's... Why is it rpm's? Because we are talking about revolutions per min. Or otherwise known by every person who has ever worked on a motor ever in his life as RPM's. Take the silver spoon out your mouth and place it.... Well, lets just see what you use it for.. Next you'll be redefining how we use the word TRM's..