[mellosouls]

XR is short for the umbrella term "eXtended Reality", though I suspect (without proof) the latter started as a backronym, with the X perhaps originally meaning the traditional placeholder "whatever" for "Augmented", "Virtual", "Mixed" etc, which "Extended Reality" encompasses.

Eg.

https://en.wikipedia.org/wiki/Extended_reality

[cjcassar]

Yes, exactly the above. Except it doesn’t replace Spatial computing conveniently