Abbreviations beginning with a

ARRSAuto Rental Reservation System
Miscellaneous » Unclassified

ARRSAutomated Repatriation Reporting System
Miscellaneous » Unclassified

ARRSAssociation of Road Racing Statisticians
Sports » Racing

ARRSDAthol-Royalston Regional School District (Massachusetts)
Miscellaneous

ARRSEThe Army Rumour Service
Governmental » Military

ARRSESAdaptive-Response-Rate Single Exponential Smoothing (computing)
Academic & Science

ARRTAdvanced Rehabilitation Research Training
Academic & Science » Universities

ARRTAmerican Registry of Radiologic Technologists
Business » Professional Organizations

ARRTApplied Rail Research Technologies
Business » Companies & Firms

ARRTAdult Reading Round Table
Community » Educational

ARRTAmerican Revolution Round Table
Community » Museums

ARRTArtists Rapid Response Team
Community » Art

ARRTAssabet River Rail Trail
Community

ARRTAdvanced Risk Reduction Tool
Computing » Software

ARRTAmerican Registry of Radiologic Technologists
Governmental » FDA

ARRTAmerican Registry of Radiology Technologists
Medical » Radiology

ARRTA River Runs Through It
Miscellaneous

ARRTAcquisition Requirements Roadmap Tool
Miscellaneous » Unclassified

ARRTAdult Reading Round Table (Illinois)
Miscellaneous

ARRTAdvanced Rehabilitation Research Training (federal grant)
Miscellaneous