English abbreviations from retain to rf
- RETAIN (Reenlistment, Reclassification and Assignment System)
- RETINA (Real Time Intelligence Applications)
- RETR (Remote Event Trigger Recording)
- RETROEUR (RETROgrade from EURope)
- RETS (Remote Target System)
- REU (Réunion (ISO 3166 trigram))
- REV (Recruitment, Engagement, and Volunteerism)
- REVS (Revolutions)
- REVTP (Reserve Components Virtual Training Program)
- REW (Rewind)
- REWK (Read only Wedge RFID Transponder, Kilohertz frequency)
- REX (General Lucio Blanco International Airport)
- REXML (Ruby Electric XML)
- REXREP (Radar Exploitation Report)
- REXX (REstructured eXtended eXecutor)
- REZ (Renewable Energy Zone (United Kingdom))
- RF (Royalty-Free)