Comment by dredmorbius

RIR: Reps in reserve.

<https://blog.nasm.org/reps-in-reserve>

0RM: One rep max. This is the (actual or theoretical) maximum weight / resistance which can be moved on a given lift. ExRx has a good calculator as well as several tables for calculating resistance at specified reps:

<https://exrx.net/Calculators/OneRepMax>