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From Wikipedia, the free encyclopedia. A cervical collar, also known as a neck brace, is a medical device used to support a person's neck. It is also used by emergency personnel for those who have had traumatic head or neck injuries, and can be used to treat chronic medical conditions.
It is used as a fastening device which allows rotational motion. Collar (n) A cylindrical feature on a part fitted on a shaft used to prevent sliding (axial) movement. Collet (n) A cone-shaped sleeve used for holding circular or rodlike pieces in a lathe or other machine.