What is the term for virtual-reality movement that tracks a user's position and rotation along three axes?

Six degrees of freedom describes virtual-reality tracking that measures a user’s position and rotation along three axes.

The six movements are translation forward and backward, left and right, and up and down, plus rotation around those same three axes. The rotations are commonly called pitch, yaw, and roll. Together, they let a VR system respond when a user leans, crouches, turns, or moves through a tracked space.

A headset with only three degrees of freedom can detect rotational movement but not changes in physical position. Many early mobile VR systems used this simpler approach. Modern room-scale systems generally aim to provide six-degree-of-freedom tracking for both headsets and controllers.

Six degrees of freedom is not itself a headset brand or software standard. It is a description of the movement data a tracking system can capture and use in a virtual environment.