swivel

This term describes a specific type of rotation that occurs around a fixed vertical or central axis, creating a pivoting motion. It is most commonly associated with mechanical hardware, such as office chairs or camera mounts, where the movement is smooth and controlled rather than erratic.

As a noun, it refers to the physical mechanism that enables this rotation. While the word is generally countable, it specifically denotes the joint or pivot point that allows for the change in orientation without moving the entire base of the object.