the Royal and Ancient Club, a golf club, headquarters of the sport’s ruling body, based in St Andrews, Scotland R&A
1. return receipt requested (used in registered mail).
An early definition of Scheme. Revised in R2RS. [“The Revised Report on Scheme”, G.L. Steele et al, AI Memo 452, MIT, Jan 1978]. (1994-10-28) [Was the original “Report on Scheme” published?] RRS Radiation Research Society
abbreviation (in Canada) 1. Registered Retirement Savings Plan
1. rail rapid transit. 1. registered respiratory therapist. RRT Registered Respiratory Therapist