| 項目 |
| I |
| I 形鋼［I-shaped steel］ |
| I フォーメーション［I formation］ |
| i［information］ |
| i［imaginary］ |
| IA［Iraqi Airways］ |
| IAA1［indole acetic acid］ |
| IAA2［International Advertising Association］ |
| IAAF［International Amateur Athletic Federation］ |
| IAB［Internet Advertising Bureau］ |
| IABP［intraaortic balloon pumping］ |
| IAC［International Apprentice Competition］ |
| IAD［Dulles International Airport］ |
| IADB［Inter-American Development Bank］ |
| IAEA［International Atomic Energy Agency］ |
| IAH［Houston International Airport］ |
| IANOS［International Assembly of National Organizations of Sports］ |
| IARC［International Agency for Research on Cancer］ |
| IARU［International Amateur Radio Union］ |
| IAS［International Accounting Standards］ |
| IASC1（イアスク）［International Accounting Standards Committee］ |
| IASC2［International Arctic Science Committee］ |
| IATA（イアタ）［International Air Transport Association］ |
| IAU1［International Association of Universities］ |
| IAU2［International Astronomical Union］ |
| IB1［Iberia Airlines of Spain］ |
| IB2［International Baccalaureate; (フ) baccalaureat international］ |
| IBA［International Baseball Association］ |
| IBBY［International Board on Books for Young People］ |
| IBE［International Bureau of Education］ |
| IBF1［International Banking Facilities］ |
| IBF2［International Boxing Federation］ |
| IBM［International Business Machines Corporation］ |
| IBRD［International Bank for Reconstruction and Development］ |
| IC1［integrated circuit］ |
| IC2［interchange］ |
| IC3［(和) interior＋coordinator］ |
| IC カード［integrated circuit card］ |
| ICA1［International Cartographical Association］ |
| ICA2［International Commodity Agreement］ |
| ICA3［International Cooperative Alliance］ |
| I.C.A.［Institute of Contemporary Art］ |
| ICAO（イカオ）［International Civil Aviation Organization］ |
| ICBL［International Campaign to Ban Landmines］ |
| ICBM［intercontinental ballistic missile］ |
| ICBP［International Council for Bird Preservation］ |
| ICC1［International Chamber of Commerce］ |
| ICC2［International Control Commission］ |
| ICD［International Classification of Diseases］ |
| ICFTU［International Confederation of Free Trade Unions］ |
| ICJ1［International Commission of Jurist］ |
| ICJ2［International Court of Justice］ |
| ICM［International Congress of Mathematicians］ |
| ICN［International Council of Nurses］ |
| .ico［icon］ |
| ICOM（イコム）［International Council of Museums］ |
| ICOMOS（イコモス）［International Council on Monuments and Sites］ |
| ICOT（アイコット）［Institute for New Generation Computer Technology］ |
| ICP［International Comparison Program］ |
| ICPD［International Conference on Population and Development］ |
| ICPO［International Criminal Police Organization］ |
| ICPUAE［International Conference on the Peaceful Uses for Atomic Energy］ |
| ICRC［International Committee of the Red Cross］ |
| ICRP［International Commission on Radiological Protection］ |
| ICSID1［International Center for Settlement of Investment Disputes］ |
| ICSID2［International Council of Societies of Industrial Design］ |
| ICSU（イクス）［International Council of Scientific Union］ |
| ICSW［International Council on Social Welfare］ |
| ICU1［intensive care unit］ |
| ICU2［interface control unit］ |
| ICW［International Council of Women］ |
| ICY［International Cooperation Year］ |
| ID1［industrial design］ |
| ID2［Republic of Indonesia］ |
| ID カード［identity card］ |
| IDA1［International Development Association］ |
| IDA2［Islamic Democratic Alliance］ |
| IDB［Inter-American Development Bank］ |
| IDCA［International Development Cooperation Agency］ |
| IDDN［Integrated Defense Digital Network］ |
| IDE［integrated device electronics］ |
| IDL［international date line］ |
| IDP［integrated data processing］ |
| IDTV［improved definition TV］ |
| IDU［idoxuridine］ |
| IE1［industrial engineering］ |
| IE2［Ireland］ |
| IEA［International Energy Agency］ |
| IEC［International Electrotechnical Commission］ |
| IEEE［Institute of Electrical and Electronics Engineers］ |
| IF1［index fund］ |
| IF2［interferon］ |
| IF3［intermediate frequency］ |
| IF4［International Sports Federation］ |
| IFABC［International Federation of Audit Bureaus of Circulations］ |
| IFAD（イファド）［International Fund for Agricultural Development］ |
| IFAP［International Federation of Agricultural Producers］ |
| IFAW［International Fund for Animal Welfare］ |
| IFC［International Finance Corporation］ |
| IFIAS［International Federation of Institutes for Advanced Studies］ |
| IFIP［International Federation for Information Processing］ |
| IFJ［International Federation of Journalists］ |
| IFN［interferon］ |
| IFOR［Implementation Force］ |
| I.F.P.［(フ) Institut francais de presse］ |
| IFPI［International Federation of the Phonographic Industry］ |
| IFR［instrument flight rules］ |
| IFRC［International Federation of Red Cross and Red Crescent Societies］ |
| IFTA［International Federation of Travel Agencies］ |
| IFTU［International Federation of Trade Unions］ |
| Ig［immunoglobulin］ |
| IGBP［International Geosphere and Biosphere Program］ |
| IGC［intergovernmental conference］ |
| IGO［intergovernmental organization］ |
| IGOSS（アイゴス，イゴス）［Integrated Global Ocean Service System］ |
| IGU［International Geographical Union］ |
| IGY［International Geophysical Year］ |
| IH 調理器［induction heating］ |
| IHB［International Hydrographic Bureau］ |
| IHD［ischemic heart disease］ |
| IHO［International Hydrographic Organization］ |
| IHP［International Hydrological Program］ |
| IHRLA［International Human Rights Law Association］ |
| IIASA［International Institute for Applied Systems Analysis］ |
| IIED［International Institute for Environment and Development］ |
| IIF［Institute of International Finance］ |
| IIP［index of industrial product］ |
| IISI［International Iron and Steel Institute］ |
| I.I.S.S.［International Institute for Strategic Studies］ |
| IIT 運賃［Individual Inclusive Tour Fare］ |
| IJF［International Judo Federation］ |
| IKF［International Kendo Federation］ |
| IKT［Irkutsk］ |
| IL1［import license］ |
| IL2［State of Israel］ |
| IL-2［interleukin-2］ |
| ILHR［International League for Human Rights］ |
| ILO［International Labor Organization］ |
| ILO 憲章［Constitution of ILO］ |
| ILO 条約［International Labor Convention］ |
| ILS［instrument landing system］ |
| ILY［International Literacy Year］ |
| IM1［imput method］ |
| IM2［Isle of Man］ |
| IMADR［International Movement against All Forms of Discrimination and Racism］ |
| IMAP4（アイマップ フォー）［internet message access protocol version 4］ |
| IMAX |
| IMC1［instrument meteorological condition］ |
| IMC2［integrated marketing communication］ |
| IMC3［International Monetary Conference］ |
| IMC4［International Music Council］ |
| IMD［idiopathic myocardial disease］ |
| IMF1［International Metalworkers' Federation］ |
| IMF2［International Monetary Fund］ |
| IMF 借款 |
| IMF 引出し権 |
| IMF 平価 |
| IMF ポジション［IMF position］ |
| IMF8 条国 |
| IMF14 条国 |
| IMF-JC［International Metalworkers' Federation-Japan Council］ |
| IML［International Microgravity Laboratory］ |
| IMO1（イモ）［International Maritime Organization］ |
| IMO2［International Mathematical Olympiad］ |
| IMO3［International Meteorological Organization］ |
| IMS［International Magnetic System］ |
| IMS 計画［intelligent manufacturing system project］ |
| IMT-2000［International Mobile Telecommunications 2000］ |
| IN1［India］ |
| IN2［Intelligent Network］ |
| In［indium］ |
| in.［inch］ |
| INA［Republic of Indonesia］ |
| INAH（アイナ）［isonicotinic acid hydrazide］ |
| INB［international brand］ |
| Inc.［incorporated］ |
| INCB［International Narcotic Control Board］ |
| IND1［India］ |
| IND2［Indianapolis］ |
| IND3［investigational new drug］ |
| INEB［International Network of Engaged Buddhists］ |
| INES［International Nuclear Energy System］ |
| INF［intermediate-range nuclear forces］ |
| .inf［information］ |
| INF 条約［INF Treaty］ |
| INGO［international non-governmental organization］ |
| .ini［initialize］ |
| INMARSAT（インマルサット）［International Maritime Satellite Organization］ |
| INP［index number of prices］ |
| INRA［International Natural Rubber Agreement］ |
| INS1［Immigration and Naturalization Service］ |
| INS2［inertial navigational system］ |
| INS3［information network system］ |
| INSPEC（インスペック）［Information Services in Physics, Electrotechnology, Computers and Control］ |
| INSTRAW（インストロー）［International Research and Training Institute for the Advancement of Women］ |
| INTELSAT（インテルサット）［International Telecommunication Satellite Organization］ |
| INTERPOL（インターポール）［International Criminal Police Organization］ |
| IO［British Indian Territory］ |
| I/O, IO［inputoutput］ |
| I/O 表［input-output table］ |
| I/O 分析［input-output analysis］ |
| IOC［International Olympic Committee］ |
| IOCS［input-output control system］ |
| IOE［International Organization of Employers］ |
| IOF［(ド) Internationale Orientierungslauffoderation］ |
| IOJ［International Organization of Journalists］ |
| IOM［International Organization for Migration］ |
| IOP［Individual Olympic Participant］ |
| IOR［Indian Ocean Rim Association for Regional Cooperation］ |
| IOSCO（イオスコ）［International Organization of Securities Commissions］ |
| IOU［I owe you.（私は君に借りがある）という文のごろ合わせ］ |
| IP1［industrial policy］ |
| IP2［information provider］ |
| IP3［internet provider］ |
| IP アドレス［internet protocol address］ |
| IPA1［icosapentaenoic acid］ |
| IPA2［Information-Technology Promotion Agency, Japan］ |
| IPA3［International Phonetic Alphabet］ |
| IPA, I.P.A.4［International Phonetic Association］国際音声学協会。音声記号の設定などを行う。1886 年設立。本部はロンドン大学。 |
| IPA5［International Publishers Association］ |
| IPB［International Peace Bureau］ |
| IPC1［Intellectual Property Committee］ |
| IPC2［International Patent Classification］ |
| IPCC［Intergovernmental Panel on Climate Change］ |
| IPCS［International Program on Chemical Safety］ |
| IPE［International Petroleum Exchange］ |
| IPI［International Press Institute］ |
| IPO［initial public offering］ |
| IPP［independent power producer］ |
| IPPNW［International Physicians for the Prevention of Nuclear War］ |
| IPPRI［International Peace Policy Research Institute］ |
| IPR［Institute of Pacific Relations］ |
| IPRA（イプラ）［International Peace Research Association］ |
| IPS［Institute for Policy Studies］ |
| IPTC［International Press Telecommunications Committee］ |
| IPU［Inter-Parliamentary Union］ |
| IQ1［intelligence quotient］ |
| IQ2［Republic of Iraq］ |
| IQ 制［import quota system］ |
| IR1［information retrieval］ |
| IR2［investor relations］ |
| IR3［Iran Air］ |
| IR4［Islamic Republic of Iran］ |
| IR5［polyisoprene rubber］ |
| Ir［iridium］ |
| IRA, I.R.A.［Irish Republican Army］ |
| IRB1［Institutional Review Board］ |
| IRB2［International Rugby Board］ |
| IRB3［Investigational Review Board］ |
| IRBM［Intermediate-range ballistic missile］ |
| IRC［International Red Cross］ |
| IRD［integrated receiverdecoder］ |
| IrDA［Infrared Data Association］ |
| IRF［Immediate Reaction Force］ |
| IRFB［International Rugby Football Board］ |
| IRI［Islamic Republic of Iran］ |
| IRL［Ireland］ |
| IRM［information resource management］ |
| IRO［International Refugee Organization］ |
| IRP［Islamic Republican Party］ |
| IRPTC［International Register of Potentially Toxic Chemicals］ |
| IRQ1［interrupt request］ |
| IRQ2［Republic of Iraq］ |
| IRRI（イリ）［International Rice Research Institute］ |
| IRS1［incident reporting system］ |
| IRS2［Information Retrieval Service］ |
| IRS3［Internal Revenue Service］ |
| IS1［information separator］ |
| IS2［Republic of Iceland］ |
| I/S［income statement］ |
| IS バランス［IS balance］ |
| ISA1［International Student Association of Japan］ |
| ISA2［International Sugar Agreement］ |
| ISAM（アイサム）［indexed sequential access method］ |
| ISAS［Institute of Space and Astronautical Science］ |
| ISB［Islamabad］ |
| ISBN［International Standard Book Number］ |
| ISC［International Seismological Center］ |
| ISCM［International Society of Contemporary Music］ |
| ISD［international subscriber dialing］ |
| ISDB［integrated services digital broadcasting］ |
| ISDN［integrated service digital network］ |
| ISF1［International Snowboard Federation］ |
| ISF2［International Sports Federation］ |
| .ish |
| ISIS［International Satellite for Ionospheric Studies］ |
| ISL［Republic of Iceland］ |
| IS-LM 分析［IS-LM analysis］ |
| ISME（イスメ）［International Society for Mangrove Ecosystems］ |
| ISO［Infrared Space Observatory］ |
| ISO2（イソ）［International Organization for Standardization］ |
| ISO 感度［ISO speed］ |
| ISO9000［International Standardization Organization 9000］ |
| ISO14000［International Standardization Organization 14000］ |
| ISO14001［International Standardization Organization 14001］ |
| ISOTYPE（アイソタイプ）［International System of Typographic Picture Education］ |
| ISP［internet service provider］ |
| ISPA［International Society for the Protection of Animals］ |
| ISR［State of Israel］ |
| ISRC［international standard recording code］ |
| ISSA（イッサ）［International Social Security Association］ |
| ISSC［International Social Science Council］ |
| IST［Istanbul］ |
| ISTEC［International Superconductivity Technology Center］ |
| ISTP［International Solar Terrestrial Physics］ |
| ISU［International Skating Union］ |
| ISV1［independent software vender］ |
| ISV2［United States Virgin］ |
| ISY［International Space Year］ |
| IT1［inclusive tour］ |
| IT2［information technology］ |
| IT3［Republic of Italy］ |
| I.T.［income tax］ |
| IT2000［Information Technology 2000］ |
| ITA1［International Tin Agreement］ |
| ITA2［Republic of Italy］ |
| ITAA［Information Technology Association of America］ |
| ITAR［(ロ) Informatsionnoe Telegrafnoe Agentstvo Rossii］ |
| ITAR-TASS［(ロ) Informatsionnoe Telegrafnoe Agentstvo Rossii-Telegrafnoe Agentstvo Sovetskogo Soyuza］ |
| ITC［International Trade Commission］ |
| ITER（イーター）［International Thermonuclear Experimental Reactor］ |
| ITF1［International Tennis Federation］ |
| ITF2［International Trade Fair］ |
| ITF コード［Interleaved 2 of 5 Code］ |
| ITI［International Theater Institute］ |
| ITIC［International Tsunami Information Center］ |
| ITIM［(ヘブライ) Itonut Yisrael Meugedet］ |
| ITO 憲章［Charter of International Trade Organization］ |
| ITP［idiopathic thrombocytopenic purpura］ |
| ITQ［individual transferable quota］ |
| ITS［intelligent transport system］ |
| ITT［International Telephone and Telegraph Corporation］ |
| ITTA［International Tropical Timber Agreement］ |
| ITTF［International Table Tennis Federation］ |
| ITTO（イットー）［International Tropical Timber Organization］ |
| ITU［International Telecommunication Union］ |
| ITU-D［ITU-Telecommunication Development Sector］ |
| ITU-R［ITU-Radiocommunication Sector］ |
| ITU-T［ITU-Telecommunication Standardization Sector］ |
| ITV［industrial television］ |
| IU［international unit］ |
| IUB［International Union of Biochemistry］ |
| IUCN［International Union for Conservation of Nature and Natural Resources］ |
| IUCW［International Union for Child Welfare］ |
| IUD［intrauterine contraceptive device］ |
| IUGG［International Union of Geodesy and Geophysics］ |
| IULA［International Union of Local Authorities］ |
| IUOTO［International Union of Official Travel Organizations］ |
| IUPAC［International Union of Pure and Applied Chemistry］ |
| IUPAP［International Union of Pure and Applied Physics］ |
| IVB［British Virgin Islands］ |
| IVBF［International Volleyball Federation］ |
| IVF［in vitro fertilization］ |
| IVH［intravenous hyperalimentation］ |
| IW［AOM French Airlines］ |
| IWA［International Wheat Agreement］ |
| IWC1［International Whaling Commission］ |
| IWC2［International Wheat Council］ |
| IWRB［International Waterfowl and Wetland Research Bureau］ |
| IWS［International Wool Secretariate］ |
| IWTC［International Women's Tribune Center］ |
| IWY［International Women's Year］ |
| IX［internet exchange］ |
| IYC［International Year of the Child］ |
| IYDP［International Year of Disabled Persons］ |
| IYF1［International Year of the Family］ |
| IYF2［International Year of the Forest］ |
| IYHF［International Youth Hostel Federation］ |
| IYP［International Year of Peace］ |
| IYRU［International Yacht Racing Union］ |
| IYS［International Year of Space］ |
| IYSH［International Year of Shelter for the Homeless］ |
| IYWIP［International Year for the World's Indigenous Peoples］ |
| IYY［International Youth Year］ |