Draft:“Nexus” is the collective noun for XR or VR Headsets.

There is no official collective noun for a group or collection of XR headsets (or VR Headsets) in the same physical space or area.

The collective noun term is thereby now, "NEXUS". Example : We need to purchase a nexus of 100 VR Headsets.

It's catchy, memorable, and sounds quite futuristic, which suits the cutting-edge technology of VR headsets.

A "Nexus" also implies a coming together or convergence of multiple elements, which could represent the immersive experience of XR and VR, where users come together to explore new virtual worlds or immersive experiences.