Industry Standard Architecture 
Internet Security and Acceleration 
International Standard Atmosphere 
Inertial Sensor Assembly 
Informix Server Administrator 
Instruction Set Architecture 
Interim Storage Area 
Instrument Society of America 
Intelligence Support Activity 
International Security Affairs 
Interservice Support Agreement 
Instrumentation Society of America 
Individual Set Asides 
Information System Architecture 
Instrumentation, Systems and Automatio… 
Integrated Services Access 
Interactive Services Association 
Internet Security and Acceleration Ser… 
Inter-Service Agreement 
Imaging sensor autoprocessor 
Independent Schools Association 
Information Systems Analyst 
Initiative for Southern Africa 
Integrated Safety Analysis 
Integrated Services Architecture 
Intelligent Speed Adaptation 
Intensive Support Amount 
Interactive Service Association 
Interconnection Security Agreement 
Interim Stowage Assembly