Compensator can refer to:Pressure control on a piston pump An alternative term for pipeline expansion joints A muzzle brake, used to counter the recoil of a firearm, or to prevent the muzzle from climbing due to kickback from the rapid firing of an automatic or semi-automatic weapon A device that offsets or counterbalances a destabilising factor: See Buoyancy compensator (diving) Buoyancy compensator (aviation) Static VAR compensator Heisenberg compensator, key part of a Transporter Lead-lag compensator Motion compensator Optical compensator, also known as a wave plate or a retarder another term for the dual-predictable projection of a Point process Compensator