#rrb

What does "rrb" mean?
RynaRICHVendorBoutique, RetiredResearchBeagle, RandomRemindersBook, RealRnB, RealRandB, RoyalRallyBadlands, RoseResidenceBeach, RoundRockBarber, RaynaRaeBand, RamonRuizBarberandbeautyshop, RollsRoyceBH, realRnB, RickRossBirthday, RoseRafaBack, RoxanaRoseBoutique, RockandRollBaby, ReallyRealBrooklyn, ripRosaB, RocknRollBaby, RockinRumorBoutique, RoodyRoodBoy, RichnRottenBosses, RonRediscoversBangkok, RaRaBound, RodesianRidgeBack, RhodesianRidgeBack, RoadReadyBoss, RubyRedBurlesque, RonaldReggaeBand, RevolutionRunBorneo