Gimbal
From Kerbal Space Program Wiki
Gimbal, thrust vectoring or thrust vector control (TVC) is the ability of engines to alter the direction of thrust by pivoting. Most liquid fuel engines and all jet engines support thrust vectoring. This feature increases the turn rate of a craft.
The Stability Augmentation System uses this system to stabilize the vessel, but sometimes the effect is so large that it tears the craft apart. To reduce this hazard it is possible to lock gimbal for each engine separately, which can also be done with action groups.
See also
- Gimbal on Wikipedia
- Thrust vectoring on Wikipedia