Integrated Defense Systems 
Intrusion Detection System 
Integrated Display System 
Informix Dynamic Server 
Intrusion Detection Systems 
International Data Service 
Integrated Data System 
Image Dissector Scanner 
Institute of Development Studies 
Integrated Delivery Systems 
Integrated Deployment System 
Interface Design Specification 
Index catalog of Double Stars 
Information Display System 
Integrated Delivery System 
Interactive Display System 
Interdisciplinary Science 
Interface Data Sheet 
Interface Design Specifications 
Interim decay storage 
Current of Drain-to-Source 
Identification Section 
Idle Signal Unit 
Image Dissection System 
individual deployment site 
Infectious Disease Service 
Infrared Detection Set 
Inorganic Dielectric Substance 
Instrument Data System 
Instrument Development Section