Other Uses
- Rail Adapter System; another name for the Picatinny rail system used for mounting accessories on modern firearms
- RAS Commonly used abbreviation in Law Enforcement for Reasonable Articulable Suspicion
- RAS syndrome, Redundant Acronym Syndrome syndrome
- Rás Tailteann, an annual cycling race in Ireland
- Regimental aviation squadron
- Recirculating Aquaculture System
- RAS Radial Arm Saw
- The Ren & Stimpy Show
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