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Ir or ir may refer to: * Iridium (chemical symbol Ir), the 77th element * .ir, the Internet country code top-level domain for Iran IR may refer to: * Iran, which has the country code IR * International relations, in political science, the study of foreign affairs of and relations among states * * ''International Relations'', a scholarly journal of the same name * Investor relations, a management responsibility in which companies disclose information for regulatory compliance and for bond/share-holders to make investment judgments * 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 * Independent-Republican Party of Minnesota, currently known as Republican Party of Minnesota * Instrument rating, the qualifications a pilot must have in order to fly under Instrument Flight Rules (IFR) * Impulse response, is a function of a dynamic system of its output when presented with a brief input signal * ''Imaginary Realities'', a MUD community online magazine * International Rescue (disambiguation) * Interracial (disambiguation) * In mathematics, the set of real numbers is sometimes written on computers as "IR", the I standing as the R's double-bar. ==Organizations== * Illinois Railway * Indian Railways, the state-owned railway company of India * Industrial relations (labor relations) * Ingersoll Rand (NYSE trading symbol IR) * Inland Revenue Department (disambiguation), a government revenue service in several countries * 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 * International Rectifier, a manufacturer of power semiconductors * International Rescue Corps, an organization inspired by the Thunderbirds TV series * Iran Air (IATA airline code IR) * 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 * Islamic Relief * Israel Railways, the state-owned railway company of Israel 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IR」の詳細全文を読む スポンサード リンク
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