| ARCQ | ARCQE | ARCR | arCRD | ARCRT |
| ARCS | ARCSA | ARCSACC | ARCSBI | ARCSEC |
| Arc Second Imager | Arc-Second Raster Chart | Arc-Second Raster Map | ARCSHS | ARCSI |
| ARCSIN | arc sine | Arcsine | Arc Sine | ARCSIP |
| Arc Spraying | Arc Spray Nanoparticle Synthesis System | ARCSS | ARCST | Arc Standard Raster Graphic |
| ARC Standard Raster Graphics | ARC Standard Raster Product | ARC/STSA | ARCSU | Arc-Submerged Nanoparticle Synthesis System |
| ARCSYM | ARCT | ARCTAN | Arctangent | arc tangent |
| ARCTAS | Arc Thermal Performance Value | ARCTIC | Arctica | Arctic Acoustic Transmission Experiment |
| Arctic Aeromedical Lab | Arctic and Alpine Stream Ecosystem Research | Arctic and Antarctic Research Institute | Arctic and Marine Oilspill Program | Arctic and North Working Group |
| Arctic, Antarctic, and Alpine Research | Arctic Athabaskan Council | Arctic Atmospheric Radiation and Cloud Station | Arctic Aviation Weather Reporting Station | Arctic Beaufort Sea Oilspill Research Body |
| Arctic Biosphere Atmosphere Coupling at Multiple Scales | Arctic Birds Breeding Conditions Survey | Arctic Borderlands Ecological Knowledge Co-operative | Arctic Bottom Water | Arctic Boundary Layer Expedition |
| Arctic Brotherhood | Arctic Campaign Memorial Trust | Arctic Cat Club of America | Arctic Cat Technology | Arctic Climate Impact Assessment |
| Arctic Climate Impact Association | Arctic Coastal Dynamics | Arctic Environmental Information and Data Center | Arctic Environmental Strategy | Arctic Forward Area Refueling Equipment |
| Arctic Fuel Dispensing Equipment | Arctic Fuel System Supply Point | Arctic Gas and Aerosol Sampling Programme | Arctic Gas and Aerosol Sampling Project | Arctic Geographic Information System |
| Arctic Goose Joint Venture | Arctic Icebreaker Coordinating Committee | Arctic Ice Dynamics Joint Experiment | Arctic Institute of North America | Arctic Investigations Program |
| Arctic Iñupiat Offshore, LLC | Arctic Land Use Research | Arctic Layer Tracking Experiment | Arctic Leads Dynamics Experiment | Arctic Learning Environment |
| Arctic LIDAR Observatory for Middle Atmospheric Research | Arctic Light Infantry Traning | Arctic Logistics Information and Support | Arctic Long-term Environmental Research Transects Program | Arctic Marine Advisory Board |
| Arctic Marine Animal Program | Arctic Mars Analog Svalbard Expedition | Arctic Mass Balance Box Model | Arctic Mid-Ocean Ridge | Arctic Mid-Ocean Ridge Expedition |
| Arctic Military Environmental Cooperation | Arctic Monitoring and Assessment Programme | Arctic Monkeys | Arctic National Wildlife Refuge | Arctic Nearshore Impact Monitoring in the Development Area Program |
| Arctic Network for the Support of the Indigenous Peoples of the Russian Arctic | Arctic Network Inventory and Monitoring Program | ARISE | Arise Capital Partners, Inc. | Arise Citizens' Policy Project |
| Arise Records | ARISF | ARISH | Arising Intellectual Property | Arising out of Employment |
| Arising Out of Employment, in the Course of Employment | ARISP | ARISS | ARIST | Arista Records |
| Aristo Parcel Shipping System | ARISTOTELES | Aristotelian Society Supplementary Volume | Aristotle Spam Defense Network | Aristotle University of Thessaloniki |
| ARIT | ARITA | a-RITD | ARITH | Arithemetic Progression |
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