| River Analysis System | Academic & Science |
| Registration, Admissions, and Status | Academic & Science |
| Russian Academy Of Sciences | Academic & Science |
| Resident and Associate Society | Academic & Science |
| Research Associates of Syracuse | Academic & Science |
| Robotics and Automation Society | Academic & Science |
| Royal Agricultural Society of New Zealand | Academic & Science |
| Rossijskaâ Akademiâ Nauk | Academic & Science |
| Royal Astronomical Society | Academic & Science |
| Rasht | Airport Code |
| Reliability And Service | Business |
| Rootes Armstrong Siddley | Business |
| Riunione Adriatica di Sicurtà | Business |
| Reimbursable Advisory Services | Business |
| Risk advisory services | Business |
| Resource Asset Investment Trust | Business |
| Replicate and Simulate | Chemistry |
| Reading Award Scheme | Community |
| Real Authentic Sound | Community |
| Registration, Administration, and Status | Computer and Networking |
| Remote Access Server | Computer and Networking |
| Row Access Strobe | Computer Hardware |
| Row Address Select | Computer Hardware |
| Random Assorted Stuff | Computing |
| Row Address Strobe | Computing |
| Resource Allocation System | Computing |
| Remote Authentication Service | Computing |
| Raster Image | Computing |
| Reusable Asset Specification | Computing |
| Reassign Allowance Sectors | Computing |
| Registration Admission and Status | Computing |
| Remote Access Software | Computing |
| Registration Authorities | Computing |
| Remote Administrator Server | Computing |
| Real Application Security | Computing |
| Results of About Search | Computing |
| Reliability Availability And Scalability | Computing |
| Really Archaic Standard | Computing |
| Remote Access Setup | Computing |
| Remote Analysis System | Electronics |
| Sun Raster Image Format | Electronics |
| Sun Raster Image Bitmap Graphics | File Type |
| Recursive Acronym Syndrome | General |
| Royal Agricultural Society | General |
| Rattle Air Supply | General |
| Remote Acceleration Sensor | General |
| Rear Air Suspension | General |
| Routing Address Source | General |
| Recaro Automotive Seating | General |
| Remote Access Support | General |
| Roadside Assistance Services | General |
| Roadmaster Active Suspension | General |
| Russian Automobile Society | General |
| Renault Accident Services | General |
| Resume Acceleration Switch | General |
| Road Safety Assurance Standard | General |
| Roadside Assistance Solutions | General |
| Rotational Allocation Strategy | General |
| Retirement Annuitant Services | General |
| Remote Administration Service | General |
| Restate Answer And Support | General |
| Restricted Active Space | General |
| Reviews About Stuff | General |
| Remote Access Sampler | General |
| Roti And Solo | General |
| Reflex Anoxic Seizures | General |
| Remote Application Server | General |
| Renin Angiotensin Systems | General |
| Rajasthan Administrator Service | General |
| Risk Appetite Statement | General |
| Rear Active Steer | General |
| Rapid Assessment System | General |
| Requirements Automation System | General |
| Remote Authorization System | General |
| Rajasthan Administrative Services | General |
| Retiree Account Statement | General |
| Rochester Animal Services | General |
| Rear Access System | General |
| Rear Axle Steering | General |
| Report Application Server | General |
| Risk Administration Services | General |
| Recirculating Aquaculture System | General |
| Required at Site | General |
| Remote Application Service | General |
| Running And Screaming | General |
| Reel Animation Studios | General |
| Rope Access Solutions | General |
| Repurposing Agrecultural Subsidies | General |
| Rootes Armstrong Siddely | Governmental |
| Return Activated Sludge | Governmental |
| Reasonable Articulable Suspicion | Governmental |
| RAS | Indian Railway Station |
| Reliability, Availability and Serviceability | Information Technology |
| Remote Access Service | Information Technology |
| Rien à Signaler | International |
| Reticular Activation System | Medical |
| Retrovirus Associated Sequences | Medical |
| Redirecting Antibody Specificity | Medical |
| Redundant Acronym Syndrome | Medical |
| Recurrent aphthous stomatitis | Medical |
| Registered Addiction Specialist | Medical |
| Renin-angiotensin system | Medical |
| Referral Access Service | Medical |
| Respiratory assessment service | Medical |
| Retinoic acid syndrome | Medical |
| Rokitansky-Aschoff sinus | Medical |
| Rotational atherectomy system | Medical |
| Renal Artery Stenosis | Medical |
| Ruthie awesomeness syndrome | Medical |
| Reticular Activating System | Medical |
| Recovery Activation Signal | Military and Defence |
| Refueling At Sea | Military and Defence |
| Rear Area Security | Military and Defence |
| Record Association System | Military and Defence |
| Relative Army Strength | Military and Defence |
| Replenishment At Sea | Military and Defence |
| Resource Allocation and Scheduling | Networking |
| Remote Access System | Networking |
| Regional Administrators Service | Regional |
| Real African Seed | Regional |
| Rail Adapter System | Regional |
| River Analysis Software | Softwares |
| Remedy Archive System | Softwares |
| Requirements Allocation Sheet | Space Science |
| Right Angle Sports | Sports |
| Racing Academy Sachsenring | Sports |
| Relative Athletic Scores | Sports |
| Relative Athletic Score | Sports |
| Remote Access Services | Telecommunication |
