ATR

• ARINC
• ATR (TV channel)
• ATR (aircraft manufacturer)
• ATR (company)
• ATR (song)
• ATR 42
• ATR 72
• ATR.1 certificate
• Absent Teacher Reserve
• Advanced Test Reactor
• Advanced tongue root
• African Traditional Religion
• Air Transport Rack
• All That Remains (band)
• Americans for Tax Reform
• Andaman Trunk Road
• Anglican Theological Review
• Answer to reset
• Arithmetical transfinite recursion
• Art therapy
• Atar International Airport
• Atari Teenage Riot
• Ataxia telangiectasia and Rad3 related
• Atmore (Amtrak station)
• Atractyloside
• Attenuated total reflectance
• Automatic target recognition
• Autothermal reforming
• Average True Range