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What does SIR stand for?

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Rank Abbr.Meaning
SIRSociety of Interventional Radiology
SIRStaten Island Railway (NY, formerly SIRT, Staten Island Rapid Transit)
SIRSelf-Insured Retention
SIRSummary Information Return
SIRSpaceborne Imaging Radar
SIRScholar in Residence
SIRSecurity Intelligence Report (Microsoft threat analysis)
SIRStandardized Incidence Ratio
SIRSerial Infrared
SIRSignal-to-Interference Ratio
SIRSurface Insulation Resistance
SIRShuttle Imaging Radar
SIRSavings-to-Investment Ratio
SIRStatistical Inventory Reconciliation
SIRStatement of Intent to Register (College)
SIRScreening Information Request (US FAA; same as RFP)
SIRSupplemental Inflatable Restraint
SIRSilent Information Regulator
SIRSerious Incident Report
SIRStatutory Invention Registration
SIRSociety of Insurance Research
SIRSingapore Infantry Regiment
SIRSeattle International Raceway
SIRSpecial Investment Region (Dholera, Gujarat, India)
SIRSociété Ivoirienne de Raffinage (Abidjan, Ivory Coast)
SIRSecurity Incident Report
SIRSoutheastern Institute of Research (ad survey firm)
SIRStandard Indonesian Rubber
SIRSons In Retirement (Northern California retired men's luncheon club)
SIRScientific Information Retrieval
SIRSelected Ion Recording (mass spectrometry)
SIRSingapore Immigration and Registration
SIRStatistical Information Retrieval
SIRSafeguards Implementation Report
SIRStepped Impedance Resonator
SIRSpeech Intelligibility Rating
SIRSafety Investigation Report
SIRSequential Importance Resampling
SIRSigma Iota Rho (international studies honorary society)
SIRSystem Investigation Request
SIRSession Initiation Request
SIRSample Inspection Report (engineering prototype)
SIRSelective Integrated Rail System (law enforcement product)
SIRSnow and Ice on Runway
SIRSupervised Intensive Restitution (Alabama prison program)
SIRSorry If Repost
SIRSimulated Intelligence Robotics
SIRSystem Integration Review
SIRSpatial Impulse Response
SIRSystem Incident Report
SIRSubmarine Intermediate Reactor
SIRService Information Request
SIRSwitched Integrated Rectifier (three phase transformer-rectifier power supply)
SIRSimple Indexing and Retrieval
SIRStandard Information Retrieval unit
SIRSystems Integrated Research (UK educational software firm)
SIRStandard-Issue Information Retrieval Unit (Invader Zim)
SIRSmooth Interpersonal Relationship
SIRSupplier Information Request
SIRSource Initiated Reservation
SIRSociety of Individual Rights (1960s San Francisco homophile group)
SIRSkill Independent Regional (Visas)
SIRScheduled Inspection and Repair
SIRSite Inspection Request
SIRService Implementation Repository
SIRSemiannual Inventory Report
SIRSmith Industrial Rubber
SIRSooner International Raceway
SIRSoftware Incident Report
SIRSensitive, Intermediate, Resistant
SIRSafety Interlock Relay
SIRSet Iron Rod
SIRSveriges Inredningsarkitekters Riksförbund
SIRSearch, Inspection & Recovery
SIRSociety of Independent Representatives Inc
SIRSpecial Inspection Requirement
SIRSequential Independent Reviews
SIRStored Information Retriever
SIRSupervisor Investigation Reports (insurance)
SIRSurveillance Information Retrieval (gaming)
SIRSpecial Investigative Requirement
SIRScramble Intercept Recovery
SIRSchool of International Relations (Iran)
SIRShort Interest Ratio (finance)
SIRSingle Instance Repository
SIRSingle Interactive Repository (computing)
SIRSpecific Information Requirement (US DoD)
SIRSpecific Insulation Resistance (electrical engineering)
SIRStarting Independent Researcher (European Research Council grant)
SIRSocial Indicators Research (various organizations)
SIRSocial Information Retrieval (various organizations)
SIRSocial Investigation Report (Juvenile Justice Act; India)
SIRSystem Impedance Ratio (power systems)

Note: We have 250 other definitions for SIR in our Acronym Attic

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