Abbreviations beginning with a

ATMOIAt the Mercy of Inspiration (band)
Miscellaneous

ATMOMAt the Mountains of Madness (movie)
Miscellaneous

ATMOSAir Traffic Management and Operations Simulator
Academic & Science

ATMOSAlgorithmic Methods and Models for Optimization of Railways (workshop)
Academic & Science

ATMOSAsynchronous Transfer Mode Optical Switching (European)
Academic & Science

ATMOSAtmospheric Trace Molecules Observed by Spectroscopy
Academic & Science

ATMOSAlgorithmic Approaches for Transportation Modeling, Optimization, and Systems (Workshop)
Community

ATMOSAdvanced Technology Multiple Operating Systems
Computing » Technology

ATMOSATmospheric Trace Molecule Spectroscopy
Governmental » NASA

ATMOSA Tiger Meeting Operating Systems
Miscellaneous » Funnies

ATMOSAtmospheric Omission System (fictional automobile software; Doctor Who)
Miscellaneous

ATMOSAutomatic Testing Multiple Operating System
Miscellaneous

ATMOSSAustralian Trade Marks Online Search System
Governmental

ATMOVEAdaptive-Template Movement
Academic & Science

ATMPAcademy of Translational Medicine Professionals
Academic & Science

ATMPAdvanced Therapy Medicinal Products
Academic & Science

ATMPAdvances in Theoretical and Mathematical Physics
Academic & Science