[poopypoopington]

Lol, I think it stands for "move" because you can do something like "mv foo bar/foo", but you can also use it to rename with mv foo bar.

[silisili]

This one always bothered me a little, pedantically. mv should, well, physically move things. It does when you cross partition or disk boundaries, of course. But doesn't when using it like a rename. I get the point, it just feels strange.

[_jstreet]

The logic alternative would be 'rename', so... 'rn'?

The issue there is that's dangerously close to 'rm'! I'll stick to 'mv' thanks.