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- Rational Software Architect, part of IBM Rational Application Developer
- Ray Steadman-Allen, a composer of choral and brass music
- Remote Supervisor Adapter an out-of-band management interface on IBM servers
- Residual stress analysis, the study of the influence of residual stress on a material's mechanical properties
- Respiratory sinus arrhythmia, the heart rate variation due to respiration
- Responsible Service of Alcohol, occupational training required in several Australian states for persons serving alcohol to patrons
- Revenu de solidarité active, a French social benefit for people with low incomes
- Roentgen Stereophotogrammetric Analysis, also called RadioStereometric Analysis, a method of calculating 3D orientation using X-ray images
- Rsa RNA, partially characterised non-coding RNA from Staphyloccus aureus
- New Hampshire Revised Statutes Annotated, the codified law of the state of New Hampshire, United States
- Santa Rosa Airport (Argentina), in La Pampa province (by IATA code)
- Revolver Stechkina-Avraamova, a designation of the Russian OTs-01 Kobalt
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