What's the RRP? I'm late...
RRP stands for Retailer Roundtable Program.
Some history about the program,
"The RRP is a invitation-only group of retailers assembled by DC Comics which addresses, in rough terms, industry issues in general and DC topics in specific. RRP Editions -- and there have been several -- are named for those promotional comics given out at meetings of the DC RRP. If it's not a DC RRP meeting, chances are it's not a RRP Edition. Further, variants are not produced for every RRP meeting. To state what should be obvious, not every promotional variant comic is a RRP. Lately, following the huge success many dealers and collectors have had with the Batman #608 RRP Edition, there have been a deluge of comics being called RRP Editions which are distinctly not RRPs."
I guess it's not DC centic anymore.