English abbreviations from ras to rat
- RAS (Regional Affairs Strategist)
- RASC ((organization) Royal Astronomical Society of Canada)
- RASCAL (Rotocraft/ Aircrew Systems Concepts Airborne Laboratory)
- RASH (Red and Anarchist Skinheads)
- RAS-OT (Readiness Assessment System - Output Tool)
- RASPUTIN (Rapid Scenario Preparation Unit for Intelligence)
- RASS ((observing program/catalog) ROSAT All-Sky Survey, used as both a name for a survey with ROSAT and the catalogs produced from the survey)
- RAST (Recovery Assistance, Securing, and Traversing Systems)
- RASU (Random Access Storage Unit)
- RAT (Ram air turbine)