Draco
Draco thrusters generate 400 newtons (90 pounds-force) of thrust using a storable propellant mixture of monomethyl hydrazine fuel and nitrogen tetroxide oxidizer.
Eighteen Draco thrusters are used on the Dragon spacecraft for attitude control and maneuvering. Dual-redundant in all axes: any two can fail and still have complete vehicle control in pitch, yaw, roll and translation.
Four Draco thrusters are used on the Falcon 9 second-stage as a reaction control system.
Read more about this topic: Draco (rocket Engine)