RR
- R&R – (i) Rest & Relaxation
- RRB – (i) Railroad Retirement Board
- RRN – (i) Recurrence Rate Number
- RRP – (i) Recurrent Respiratory Papillomatosis
- RRS – (i) Racing Rules of Sailing
- RRSP – (i) Registered Retirement Savings Plan (Canada; roughly equivalent to the IRA in the U.S.)
Read more about this topic: List Of Acronyms And Initialisms: R