University of California, Davis, CA
Excerpt from a student e-mail regarding placement of the origin (pivot point) for torque calculations:
Anyways I just had a thing [that] helped me in PHYS 7B. "Beware where you place your P.P." P.P. as in pivot point you know, but it's cool cause it sounds like pee-pee. Ha-ha, well anyways, thanks for being a good prof and bearing with my office hour visits.