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International Monitoring System (CTBTO)
The International Monitoring System is the CTBTO's global network of 337 stations and laboratories in 89 countries, built to detect nuclear explosions underground, underwater, or in the atmosphere.
International Mother Language Day
International Mother Language Day (国际母语日), 21 February, a UNESCO-proclaimed observance since 2000 on Bangladesh's initiative, commemorating the 1952 Dhaka Bangla language martyrs and promoting multilingual education and linguistic diversity.
International Museum of Ceramics (Faenza)
The International Museum of Ceramics in Faenza is an Italian museum of ceramics from every age and continent, founded in 1908 and housed in the former convent of San Maglorio.
International Music Score Library Project
The International Music Score Library Project (IMSLP), also known as the Petrucci Music Library, is a wiki-based online library of public domain music scores launched in 2006.
International MV Series
The International MV Series is a Class 6/7 medium-duty commercial truck from International Motors, introduced in 2018 to replace the DuraStar, offered with Cummins B6.7 and L9 engines.
International Natural Rubber Organization
The International Natural Rubber Organization (INRO) was the body administering the 1979 International Natural Rubber Agreement, stabilizing rubber prices with a jointly financed buffer stock until its 1999 collapse.
International non-governmental organization
International non-governmental organization (INGO): cross-border nonprofit active in humanitarian, development, and rights work; term coined 1945; ECOSOC consultative status since 1946; distinct from local NGOs by transnational scope and donor funding.
International nonproprietary name
International nonproprietary name (INN), or generic name, is the WHO-selected unique public-domain name for a pharmaceutical substance; system begun 1953, uses common stems like -mab and -tinib, about 9,300 names.
International Normalized Ratio
International Normalized Ratio (INR): standardized reporting of the prothrombin time, INR = (PT_patient/MNPT)^ISI, used to monitor warfarin and other vitamin K antagonist therapy; developed by WHO from 1977 onward.
International North–South Transport Corridor
The International North–South Transport Corridor (INSTC) is a 7,200 km ship, rail, and road route linking India and the Persian Gulf through Iran to Russia.
International Nuclear and Radiological Event Scale
The International Nuclear and Radiological Event Scale (INES) is a logarithmic scale from 0 to 7, created in 1990 by the IAEA and the OECD/NEA to communicate the safety significance of nuclear and radiological events.
International numbering administration
International numbering administration is the ITU's governance of shared telecommunication numbering resources, chiefly E.164 country codes, assigned by its Telecommunication Standardization Bureau under Recommendation E.190.
International Nurses Day
International Nurses Day (IND), held every 12 May on Florence Nightingale's birthday, is led by the International Council of Nurses with an annual themed report; 2020 was the WHO International Year of the Nurse and the Midwife.
International Obfuscated C Code Contest
International Obfuscated C Code Contest (IOCCC), annual contest since 1984 for the most creatively unreadable C programs, judged by Landon Curt Noll and Leonid A. Broukhis, size-limited by iocccsize, resumed in 2024 after a four-year hiatus.
International of Anarchist Federations
International of Anarchist Federations (IAF-IFA), also Internationale des Fédérations Anarchistes, an international coordination of social anarchist federations founded at Carrara, Italy, in 1968, tracing its principles to the 1872 Saint-Imier First International, with congresses every four years and a rotating secretariat.
International Olympiad in Artificial Intelligence
International Olympiad in Artificial Intelligence (IOAI): annual International Science Olympiad for high-school students, founded 2024 in Burgas, Bulgaria; 2026 edition in Astana with 108 countries, plus the IOAI² autonomous AI systems track.
International Olympiad in Informatics
International Olympiad in Informatics (IOI), annual international programming competition for secondary school students, first held 1989 in Pravetz, Bulgaria under UNESCO; up to 4 contestants per country, two five-hour contest days, about 80 participating countries.
International Olympic Committee
The International Olympic Committee (IOC), or Comité international olympique, is an independent, non-governmental organization founded by Pierre de Coubertin in Paris in 1894 that guards the Olympic Games.
International olympic truce centre
International Olympic Truce Centre (Διεθνές Κέντρο Ολυμπιακής Εκεχειρίας), IOTC, founded July 2000 by Greece and the IOC, headquartered in Athens, promotes the Olympic Truce and peace education.
International ophthalmology
International Ophthalmology (Int Ophthalmol), a Springer peer-reviewed ophthalmology journal founded 1978 in the Netherlands, ISSNs 0165-5701 and 1573-2630, MEDLINE-indexed since volume 1, print ceased 2012, SJR Q2.
International Order of the Rainbow for Girls
International Order of the Rainbow for Girls (IORG, Rainbow Girls), Masonic-linked fraternal youth order for girls founded April 6, 1922 in McAlester, Oklahoma by Rev. W. Mark Sexson; 850+ assemblies, seven rainbow-color lessons, headquarters in McAlester since 1951.
International organization
International organization: a permanent institution of three or more states (or non-state members) created by treaty, covering intergovernmental organizations like the UN, WTO, and NATO and international NGOs, with legal personality, League of Nations origins, and UN Charter structure.
International Organization for Migration
The International Organization for Migration (IOM), founded in 1951 as the Intergovernmental Committee for European Migration, is a Geneva-based intergovernmental organization promoting humane and orderly migration.
International Organization for Standardization
International Organization for Standardization (ISO), non-governmental standards body founded 1947 in Geneva; 177 national member bodies, 844 technical committees, publisher of ISO 9001 and related standards.
International Organization of Legal Metrology
The International Organization of Legal Metrology (OIML), from the French Organisation Internationale de Métrologie Légale, is an intergovernmental treaty organization founded in Paris in 1955 to harmonize legal metrology worldwide.
International Organization of Motor Vehicle Manufacturers
The International Organization of Motor Vehicle Manufacturers (OICA), a Paris-based federation of national automobile trade associations founded in 1919, represents the industry before the United Nations and compiles world production statistics.
International Organization of Securities Commissions
The International Organization of Securities Commissions (IOSCO) is the global standard setter for securities regulation, with over 200 members from more than 130 jurisdictions representing 99% of the world's financial markets regulators.
International Packet Communications Consortium
The International Packet Communications Consortium (IPCC) was an industry association in San Ramon, California, formed in 2003 from the International Softswitch Consortium and later transitioned into the IMS Forum.
International Paper
International Paper is an American packaging company headquartered in Memphis, Tennessee. Founded in 1898, it reported $23.63 billion in net sales in 2025 and plans to split into two companies.
International Paralympic Committee
International Paralympic Committee (IPC), founded 22 September 1989 in Düsseldorf, headquartered in Bonn, Germany: global governing body of the Paralympic Movement with 211 member organisations, President Andrew Parsons, organizer of the Paralympic Games and owner of the classification system.