I Follow Railroad (SAUS)
I Follow Roads (XSAL)
Ifrane - Morocco - Seismograph station code, US Geological Survey (SEIS)
IFR Systems, Inc. - Associated Press (SAG)
Image-to-Frame Ratio
Immediate Free Recall (PDAA)
Imported Food Regulations - British
Impulse Fast Reactor - Former USSR
Impulse Frequency Rate (VLIE)
Income Fund Reimbursable (SAUS)
Increased Frequency Reporting (SAUS)
Increasing Failure Rate
Incremental Financial Rate of Return
Indian Foodgrain Requirements - British
Industrial Fuels & Resources, Inc. (EFIS)
Infer - Telegraphy (PCTE)
In-Flight Refueling
Information Flow Rate (SAUS)
In-Frame Response - Automotive engineering - Electronics
Infrared
Infrared Filter Radiometer
Inspiratory Flow Rate - Physiology
Instantaneous Frequency - Indicating Receivers (IEEE)
Instant Failure Report (ACAE)
Institute of Fisheries Research - University of North Carolina
Institute of Food Research - British
Institut Federatif de Recherche - Federal Research Institute - France
Instituts Federatifs de Recherche - France
Instrument Fighter Rules (SAUS)
Instrument Flight Recovery - NASA
Instrument Flight Regulation (SAUS)
Instrument Flight Research (SAUO)
Instrument Flight Rules - Aviation
Instrument Flying Regulations (SAUS)
Insufficient Data For Reporting (WDMC)
Integral Fast Reactor - Nuclear energy
Interface Register
Interim Final Rule - RSPA (TAG)
Interleaved Frame Recording (SAUS)
Intermediate Free Recall (SAUO)
Intermediate Frequency Range (MCD)
Internal Function Register
Internationaler Frauenrat - International Council of Women
International Federation of Radio Officers (SAUO)
International Federation of Radio-Telegraphists (SAUO)
International Federation of Religions (SAUO)
International Fellowship of Reconciliation (SAUO)
International Fiction Review - A publication (ANEX)
International Fighter RADAR
International Film Representatives - Division of International Film Completion Corp.
International Financing Review - A publication
International Flyer Resources Ltd. - Vancouver Stock Exchange symbol
Interrupt Flag Register - Computer science (IAA)
Intrinsic Failure Rate (VLIE)
Isolated Flow Responder - Physiology
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