pressure ratio controller

proportional–integral–derivative controller (PID controller / three-term controller)

proportional–integral–derivative controller / PID Controller / three-term controller

reduction ratio / gear ratio

terminal attack controller (TAC) (= forward air controller)

Voltage Standing Wave Ratio (VSWR) / voltage standing-wave ratio

jam to signal ratio (J/S ratio)

base pressure ratio

differential pressure controller

engine pressure ratio (EPR)

pressure ratio

reference pressure ratio

compressor pressure ratio (CPR)

air controller

aspect ratio

controller (exercises)

fighter controller

fighter-to-administrative personnel ratio

forward air controller (FAC)

high expansion-ratio

mass ratio

power-to-weight ratio

signal-to-noise ratio (SNR; S/N)

Special Operations Terminal Attack Controller (SOTAC)

tactical air controller

thrust-to-weight ratio

joint terminal attack controller (JTAC)

forward air controller (airborne) FAC(A)

forward air controller party

ground-based forward air controller

damping ratio

heliborne forward air controller

attenuation ratio