That's easy: It's a Richard Burns edition. He was a World Rally Champion, recently passed away from a brain tumor.
RB as it is at this time
RB means random boner
You have to go to a dark place and press rb,x. It should be equipped!
Rb is not a known indicator for the mineral diamond.
it means right back..
it stands for rubidium.
R134a
If you mean RB, then it is Regulus Black.
No , it is not an interference engine
RB means refined bullion and it's 14K (14 karot) so it's about 50% gold if i'm not mistaken..
equipped
Rb is the symbol for the element, rubidium.