IR

IR

IR may refer to:

Business:
* Illinois Railway (AAR reporting marks IR), a Class III railroad in Illinois, USA.
* Indian Railways, the state-owned railway company of India
* Industrial relations (labor relations)
* "Ingénieur" ("Ir"), Engineer, someone who practices the profession of engineering
* Ingersoll-Rand Company Limited (NYSE trading symbol IR)
* Integrated Resort, a euphemism for a casino in Singapore
* Internal Revenue Service, the United States government agency that collects taxes and enforces the internal revenue laws. The IRS is a bureau of the Department of the Treasury
* International Rectifier Corp., a manufacturer of power semiconductors
* International Rescue Corps, an organisation inspired by the Thunderbirds show's premise.
* Investor relations, a set of activities which relate to the ways in which a company discloses information required for regulatory compliance and good investment judgment to bond and/or shareholders and the wider financial markets
* Iran Air (IATA airline code IR)
* Irish Rail, the national passenger and freight railway system of the Republic of Ireland

Computer:
* Information Resources, sometimes used as an alternative to Information Technology
* Information retrieval, the science of searching for information in documents, searching for documents themselves, searching for metadata which describe documents, or searching within databases
* Informational Revolution, one of the theoretical frameworks within which trends in current society can be conceptualized
* Institutional repository, an online locus for collecting and preserving - in digital form - the intellectual output of an institution, particularly a research institution
* Institutional research, the collection, analysis, and reporting of institutional data
* Instruction register, refers to the part of a CPU's control unit
* Intermediate representation, a computer data structure

Fiction:
* I. R. Baboon from the cartoon series I am Weasel
* Ir, in Irish legend, was one of the sons of King Milesius who took part in a semi-legendary invasion of Ireland.
* International Rescue, the fictional rescue organization seen in Thunderbirds

Language:
* ir —"city", Hebrew
* ir —"to go", Spanish, Portuguese

Medicine:
* Insulin resistance
* Interventional radiology
* Ionizing radiation

Politics:
* Independent-Republican Party of Minnesota, currently known as Republican Party of Minnesota
* International relations, a branch of political science, is the study of foreign affairs of and relations among states within the international system

Science:
* Infrared, a portion of the electromagnetic radiation spectrum
* Infrared spectroscopy
* Inverted repeat, a sequence of nucleotides that is the reversed complement of another sequence further downstream
* Iridium, The 77th element

Sports:
* Injured reserve, a special sports reserve list for professional teams to use if a player is injured and unable to play for an extended time
* International Rules a hybrid code of football

Other:
* ImageReady, a bitmap graphics editor shipped with Adobe Photoshop by Adobe Systems
* Incident report
* Instrument Rating, refers to the qualifications that a pilot must have in order to fly under Instrument Flight Rules (IFR)
* Inter-racial, particularly in the Pornography industry.
* Iran (country code: IR, Internet domain: .ir)
* In Rainbows, the seventh studio album by the alternative rock band Radiohead
* Sometimes, in mathematics, IR is written in lack of a blackboard bold R (mathbb{R}), representing the real numbers.


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