how does that compare because "6" doesn't mean anything to me.dof is degrees of freedom with motion.
Technically the numbers can refer to any axes.
In the VR space, the general measurement is that 3 refers to rotational tracking and 6 is rotational + positional tracking.
Most headsets support 6dof. Oculus Go and GearVR were the notable examples that didn't.
It's notable in this case because the headset is so small, last year's version only support rotational tracking.