[lobochrome]

sqm instead of m^2 is also just a way of typing it on a mobile keyboard.

[setopt]

I’m more used to seeing “m2” on mobile, but it’s probably different between regions.

[jeroenhd]

More people seem to find the ² on mobile keyboards than they do on desktop keyboards. It's still rather uncommon, though.

If anything, I would've expected phone keyboards to turn m2 into m².