
A reaction control system (RCS) is a spacecraft system which uses thrusters to provide attitude control, and sometimes translation. Use of diverted engine thrust to provide stable attitude control of a short-or-vertical takeoff and landing aircraft, below conventional winged flight speeds, such as the Harrier `jump jet`, may also be referred to .....
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http://en.wikipedia.org/wiki/Reaction_control_system

System of thrusters used to control spacecraft attitude.
Found on
http://www.braeunig.us/space/glossary.htm
(RCS) A type of attitude control system that uses small, low-thrust vernier engines to provide three-axis control of a spacecraft in the absence of aerodynamic forces. Most RCS systems employ a cold gas such as nitrogen, although some operate using hydrazine. Pointing accuracies...
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http://www.daviddarling.info/encyclopedia/R/reaction_control_system.html
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