What does "MR " mean? (As in "Awesome Non-MR things " in the menu bar at lower left)?

[G+_Jon Klinkefus]

What does "MR" mean? (As in "Awesome Non-MR things" in the menu bar at lower left)?

 

--Klink

[G+_Dan Molseed]

Multi rotor I believe.

[G+_Jon Klinkefus]

Cool. Thanks!