fighter-to-administrative personnel ratio

reduction ratio / gear ratio

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

jam to signal ratio (J/S ratio)

air-dominance fighter / air dominance fighter

ratio of service to fighting personnel

administrative company / administrative support company

key administrative personnel

servicing personnel / maintenance personnel

aspect ratio

high expansion-ratio

mass ratio

power-to-weight ratio

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

thrust-to-weight ratio

damping ratio

attenuation ratio

base pressure ratio

weight-horsepower ratio

weight-strength ratio

depression ratio

explosion ratio

infantry-armor ratio

forward gear ratio

fuel-air ratio

fuselage fineness ratio

compression ratio

engine pressure ratio (EPR)

excess air ratio

fuel hydrogen / carbon ratio

hub-tip ratio

mixture ratio

pressure ratio