- RSO
- Roger & Sherry Olsen Livestock (Business » Firms)* Registered Student Organization (Academic & Science » Universities)* Revised Statutes of Ontario (Regional » Canada Provinces)* Revised Statutes of Ontario (Governmental)* Registered Sex Offender (Governmental » Police)* Roanoke Symphony Orchestra (Community » Music)* Road Safety Officer (Governmental » Police)* Retirement Services Officer (Business » Positions)* Rectified Skew Orthomorphic (Academic & Science » Mathematics)* Reconnaissance Systems Officer (Governmental » Military)* Regional Support Organization (Governmental » Military)* Rapid Scan Operation (Computing » General)* Reconnaissance and Surveillance Operation (Governmental » Military)* Rochester Student Organization (Academic & Science » Universities)
Abbreviations dictionary. 2012.