A Swivel

1. (mechanical) A piece, as a ring or hook, attached to another piece by a pin, in such a manner as to permit rotation about the pin as an axis. Swivel - Wikipedia
2. (military) A small piece of ordnance, turning on a point or swivel; called also swivel gun.
3. (slang) Strength of mind or character that enables one to overcome adversity; confidence; force of will.
4. (dance) A rotating of the hips.