Independent Research Service
Indian Register of Shipping
Industrial Robot System
Infinitely Rigid System
Information Receiving Station
Infrared Reflectance Spectroscopy
Inquiry and Reporting Service
Inquiry and Reporting System
Insulated Return System
Internal Reflectance Spectroscopy
International Referral System
International Repeater Station
Inverse Raman Spectroscopy
Investment Removal Salt
Iridium Monosulfide
Irrigation Research Station
Isotope Removal Service
Isotope Removal System
Image Retrieval System
Immune Restoration Syndrome
In a rare setback
Incident Reports
Index of Retail Saturation
Indian Remote Sensing Satellite
Individual Research Study
Inherited Runners who Scored
Instituto de Reinserção Social
Instituto Roberto Simonsen
Insulin Receptor Signaling
Integrated Reception Systems
Interactive Reference Service
Investment Research Service