EPR
Engine pressure ratio. The ratio of the turbine discharge total pressure to the compressor inlet total pressure. EPR is normally used as the parameter to determine the amount of thrust an axial-flow turbojet or turbofan engine is producing.
Aviation Maintenance Technician Handbook — Powerplant, p. G-11
Also defined in 1 more source
See engine pressure ratio.
Taught in PP-D Quick reference.