IR

Ir, ir or IR may refer to:

IR may refer to:

Organizations

Ingersoll Rand (NYSE trading symbol IR)
International Rectifier, a former manufacturer of power semiconductors
Independent-Republican Party of Minnesota, former name of the Republican Party of Minnesota

Illinois Railway, US
Indian Railways, the state-owned railway company of India
Iran Air (IATA airline code)
IR Ishikawa Railway, the local railway company in Ishikawa, Japan
Iarnród Éireann (Irish Rail), the national passenger and freight railway system of the Republic of Ireland
Israel Railways, the state-owned railway company of Israel

Iridium (chemical symbol Ir), the 77th element
Infrared, a portion of the electromagnetic radiation spectrum
Insulin receptor, a transmembrane receptor that is activated by insulin
Insulin resistance, a pathological condition
Inverted repeat, a sequence of nucleotides that is the reversed complement of another sequence further downstream
Interventional radiology and interventional radiologist, an independent medical specialty
Ionizing radiation
Immediate-release, related to time release technology in pharmaceuticals
Impulse response, is a function of a dynamic system of its output when presented with a brief input signal

Adobe ImageReady, a bitmap graphics editor shipped with Adobe Photoshop by Adobe Systems
Information retrieval, the science of searching for information in or as documents or databases
Information revolution, one of the theoretical frameworks within which trends in current society can be conceptualized
Institutional repository, a digital collection for preserving the intellectual output of an institution
Institutional research, the collection, analysis, and reporting of institutional data
Instruction register, part of a CPU's control unit
Intermediate representation, a computer data structure
Image retention, the LCD and plasma display equivalent of screen burn
.ir, the Internet country code top-level domain for Iran

Incidence Rate, in market research
Interest rate, or (when referring to an asset class) interest rate derivative
Information ratio, when referring to risk-adjusted returns of a financial security
Investor relations, a management responsibility in which companies disclose information for regulatory compliance and for bond/share-holders to make investment judgments

Ingenieur, an engineer's degree in the Netherlands and Belgium
Injured reserve list, a reserve list for professional teams to use if a player is injured and unable to play for an extended time
International rules football a hybrid code of football
Imaginary Realities, a MUD community online magazine
Integrated resort, a euphemism for a casino in Singapore
Iran (country code IR)
International relations, in political science, the study of foreign affairs of and relations among states
- International Relations (journal), an academic journal
I.R. Baboon from the cartoon series I Am Weasel