What does IRS stand for?

Identical, Related, or Similar - A drug classification (TPAL)

Identification and Reference Sheets (MCD)

Illinois Radiological Society (SAUO)

Immunoreactive Secretin - Endocrinology

Immunoreactive Somatostatin - Endocrinology

Improved RADAR Simulation (DWSG)

Improved Radar Simulator (SAUS)

Impurity Removal System

Inactive Reserve Section - Military

Inboard Rotating Shield

Incident Reporting System - IAEA (NUCP)

Income Reduction Service (SAUO)

Incremental Range Summary

Independent Rear Suspension - Automotive engineering

Independent Research Service - Defunct

Indian earth Research Satellite (SAUS)

Indian Railway Standards (SAUO)

Indian Remote Sensing

Indian Remote-Sensing Satellite

Indian Resources Satellite (SAUS)

Indirect Representative Supplement - British

Induction and Recruiting Station - Marine Corps

Industrial Relations Section - Princeton University - Research center (RCD)

Industrial Relations Services - Eclipse Group Ltd. - British

Industrial Rubber Sales (SAUS)

Industry-Research-Services (SAUO)

Ineligible Reserve Section

Inertial Reference Sensor

Inertial Reference System - Aviation

Inertial Retical System

Infant Rating Scale - Child development test

Infinitely Rigid System - Engineering (OA)

Inflatable Restraint System - Automotive engineering

Informal Routing Slip

Information Receiving Station (SAUS)

Information Recovery - or Retrieval System - or Subsystem

Information Referral Service (SAUS)

Information Reporting System - Military technology (DDF)

Information Research Services - Information service or system (IID)

Information Resources Specialists - Information service or system (IID)

Information Retrieval Service - European Space Agency (IID)

Information Retrieval Service - Memphis State University Libraries (OLDSS)

Information Retrieval Subsystem (SAUS)

Information Retrieval System (OICC)

Infrared RADAR Suppressor (MCD)

Infrared Reconnaissance Set (MCD)

Infrared Reflective Spectra

Infrared Reflow-Solderable (SAUS)

Infra-Red Scanner (SAUS)

Infra Red Soldering (SAUS)

Infrared Soldering

Infrared Source

Infrared Spectrometer - or Spectroscopy

Infrared Spectrophotometry (PALA)

Infrared Spectrum (SAUS)

Infrared Star (BARN)

Initial Readiness Site (SAUS)

Inorganic Resin System - Fire-resistant cement

Input Read Submodule

Inquiry and Reporting System

Insane Renegade Modders

Insertion Reference signal (SAUS)

Inspection Record Sheet

Inspection Report Sheets (SAUO)

Inspector of Radio Services - Military (IAA)

Installation Readiness System - Army

Instantaneous Response Spectra (SAUS)

Institute for Industrial Research and Standards (SAUO)

Institute of Regional Studies - Research center (APS)

Institute of Regional Studies - Research center (RCD)

Institute of Religious Studies - Australia

Institute of River Studies - Research center (RCD)

Instructional Review System

Instrumentation RADAR Set

Instrumentation Radar System (SAUO)

Instrument Removal System (SAUS)

Instrument Retrieval System - Containers - Medicine (DAVI)

Insulated Return System (SAUS)

Insulin Receptor Species - Medicine (DMAA)

Insulin Receptor Substrate - Biochemistry

Insurance Sales - A publication (SAUS)

Intact Rock Strength - Mining

Integrated Radiator System (SAUS)

Integrated Rate System

Integrated Recovery Scheduling (SAUS)

Integrated Reporting System (SAUO)

Integrated Retrieval System (SAUS)

Integrated Review Schedule - Department of Health and Human Services (GFGA)

Integration Review Section - Social Security Administration

Intelligence Research Specialist - Military (MCD)

Intelligible Reserve Section (SAUO)

Interactive Retrieval Software (SAUO)

Interchange Record Separator - Computer science (BUR)

Interdivisional Records Standard (SAUS)

Interface Requirements Document - DoD

Interface Requirements Specification (MCD)

Interferon Response Sequence - Genetics

Interformation Retrieval System (SAUS)

Intergovernmental Relations Staff (SAUO)

Intergroup Rhabdomyosarcoma Study - Oncology

Interim Retrievable Storage - Office of Environmental Management, Department of Energy (DEEM)

Intermedia Ranking Staff (COE)

Intermediate Reference Structure

Intermediate Reference System (SAUO)

Internal Reflection Spectroscopy

Internal Revenue Service - Department of the Treasury - Washington, DC

Internal Revenue Service Library, Washington, DC - OCLC symbol (OCLC)

Internationally Recruited Staff (SAUO)

International Radio Science (SAUS)

International Radio Silence

International Records Syndicate, Inc.

International Recruiting Service (SAUO)

International Reference Unit (SAUS)

International Referral Service (SAUO)

International Referral System - United Nations Environment Programme

International Referral Systems - An environmental protection agency (IDEM)

International Repeater Station - Telecommunications (TEL)

International Research Service (SAUO)

International Reservation Switzerland (SAUO)

International Rhinologic Society (EA)

International Rorschach Society - Strasbourg, France (EA)

Internetwork Routing Service - Telecommunications (OSI)

Interpersonal Relationship Scale (EDAC)

Interrecord Separator (SAUS)

Interspersed Repetitive Sequence - Genetics

Inverse Raman Scattering - Spectroscopy

Investment Removal Salt (SAUS)

Investor Relations Society (COBU)

Iodine Removal System - Nuclear energy (NRCH)

Ionospheric Radio Signal

Iran Service - A publication (SAUS)

Irish Standard (IAA)

Irish Standards Institute (SAUO)

Irregularities - Telegraphy (PCTE)

Irrigation Research Station (SAUO)

IRSA Inversiones y Rep GDS - NYSE symbol

IRSA Inversions y Representaciones SA - NYSE symbol (SAG)

Isentification and Reference Sheets (SAUS)

Isoleucyl-tRNA Synthetase - An enzyme

Isotope Radiography System

Isotope Removal Service (IEEE)

Isotope Removal System (SAUS)

Item Reduction Studies (MSA)

O.H. Iris (Orbea Hermanos) - NCIC firearms make code (NCIC)

Stay Afloat Boat Works, Bradenton, FL - Manufacturer code for watercraft hull identification number (USCG)

Sturgis, MI - Location identifier - FAA (FAAL)

Transavia Ltd. - Romania - FAA designator (FAAC)

Independent Rear Suspension