reverse osmosis unit

reverse osmosis (water) purification unit (ROPU / ROWPU)

shipboard reverse osmosis desalinator (SROD)

reverse bearing

reverse engineering ( back- wards engineering)

reverse gear

reverse one's field

reverse slope

reverse slope defense

reverse transit

ditch in reverse

ditching in reverse

idler reverse gear

worm reverse gear

engaging reverse gear

reverse idle thrust

reverse-flow

reverse-flow combustion chamber

reverse flow

reverse pitch of airscrew

reverse thrust noise

reverse the field

reverse tweezers

Forward/Reverse (3D mode)

Resets all motor spin directions, then allows the user to choose which to reverse

Reverse

Reverse the motors to flip over an upside down craft after a crash (DShot required)

battery coolant unit / battery-coolant unit (BCU)

gear reduction unit / gear-reduction unit

position and navigation unit / position navigation unit (PNU)

pinch (a unit) out of a large unit

administrative support unit

air assault infantry unit