Internet Information Services 
Internet Information Server 
Intelligence and Information Systems 
Institute of Information Scientists 
Implanted Ion Sensor 
Institute of Industrial Science 
Internet Information Service 
Iraqi Intelligence Service 
Index to International Statistics 
Inflationary Impact Statement 
Inspection Item Sheet 
Integrated Information Services 
INTEGRATED INFORMATION SYSTEM 
Intelligence Information System 
Internet Information System 
CIGNA INVESTMENT SECURITIES, INC. 
Idealized Instruction Set 
Imagery Interpretation Segment 
Imaging Index System 
Impairment Scale 
Implementation, Interoperability and C… 
India Information Service 
Indian Institute of Science 
Indirect Identification System 
indirect immunofluorescent stain 
Industry Information Security 
Information and Intelligent Systems 
information system 
Institut fuer Integrierte Schaltungen 
Institute for Industrial Studies