Rolls Royce RB211 series engines
The first of the RR RB211 family of engines was the -22 as fitted to the L1011 Lockheed TriStar. The engine was a development by Rolls of the first, that I know of, to have three spools. (Fan, LP Compressor, HP Compressor) all with their own Turbine sections and all on seperate shafts rotating at different RPMs. RB comes from Rolls Royce Barnoldswick where the engine was designed.