Intelligence Analysis System 
Internet Authentication Service 
International Accounting Standards 
Indicated Air Speed 
Institute of Advanced Studies 
Information Access Service 
Image Assessment System 
Imagery Architecture Study 
Impact Assessment Sheet 
Institute for Advanced Study 
Institute of Aerospace Sciences 
Integrated Avionics System 
International Accounting Standard 
I Am Sorry 
Image Analysis System 
Immediate Access Storage 
Indian Administrative Service 
indicated airspeed 
Individual Augmentees 
inelastic atom scattering 
Institute for Advanced Studies 
Institute of Aeronautical Sciences 
Instrument Analog Slice 
Integrated Airline Solutions 
intermittent androgen suppression 
Internal Audio Subsystem 
Internal Audio System 
International Aid Sweden 
International Association of Sedimento… 
Internet Access Server