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The Opaui Guide to Lists of
Acronyms, Abbreviations, and Initialisms
on the World Wide Web



  • Accountancy: Abbreviations and acronyms from CPATeam.
  • Accountancy: American Institute of Certified Public Accountants.
  • Accountancy: Institute of Chartered Accountants in England and Wales.
  • Afghanistan: Reconstruction effort.
  • Africa: Abbreviations and acronyms related to African studies, with special reference to southern Africa.
  • Agriculture: Too useful for general agronomy to classify under "Rice" alone.
  • Agriculture: Giannini Foundation Library.
  • Agriculture: From the Caribbean Agricultural Information Service.
  • Alaska: From the Alaska Housing Finance Corporation.
  • Arctic Science: Polar acronyms (IASC Secretariat).
  • Astronomy & Space: Canonical astronomy abbrev/acro list.
  • Automotive: Car terminology, autoparts, etc.
  • Automotive: Hawkman's Automotive Webspace.
  • Australia: Acronyms in Australian medical practice.
  • Australia: Australian Maritime Safety Authority.
  • Australia: Geoscience Australia.
  • Aviación: Abreviaturas aeronáuticas (Gacías).
  • Aviation: Honeywell.
  • Aviation: USAAF.

  • Biodiversity: Abbreviations and acronyms related to the Convention on Biological Diversity.
  • Biotechnology: Biotechnology Abbreviation and Acronym Uncovering Service (BioABACUS).
  • Building: Common acronyms in the (Canadian) construction industry.

  • Canada: Government abbreviations from .ca-land.
  • Chemistry: Abbreviations of chemical compounds / Abkürzungen chemischer Verbindungen (en, de).
  • Chemistry: Abbreviations Related to International Chemical Safety Activities (US EPA).
  • Climate Change: Carbon Dioxide Information Analysis Center.
  • Computers and Telecommunications: Babel.
  • Computers and Telecommunications: Ultimate computer acronyms archive.
  • Computers and Telecommunications: Internet, Usenet, chat, omg, lol, ugh (Thomas).
  • Countries: Two-letter ISO 3166 codes, plus three-letter ISOs and (one layer further in) national flags.
  • Currencies: claves ISO 4217 (monedas) e ISO 3166 (países); country/currency codes, in Spanish.

  • Earth Sciences: Atmospheric radiation measurement program.
  • Earth Sciences: Dictionary of quaternary acronyms.
  • Earth Sciences: Geographic information systems, cartography, remote sensing.
  • Education: Higher education acronyms (UNESCO-CEPES).
  • Education: Common acronyms in adult education (SABES).
  • Education: English language teaching terminology.
  • Education: The Commonwealth of Learning.
  • Education: Higher education funding in the UK.
  • Electronics: Common abbreviations and acronyms in electronics (Kaytaz).
  • Energy: Nuclear reactors, waste, safety, etc. (NKS).
  • Energy: Oil refinery acronyms and abbreviations.
  • Environmental: Association of Engineering Geologists.
  • Environmental: "Terms of Environment" (US EPA).
  • Environmental: Mexico-USA border concerns, en & es (TRIP).
  • Environmental: US Department of Energy.
  • Europe: EU (Belair).

  • Finance: NUMA dictionary of derivatives acronyms.
  • Finance: Investopedia.

  • Genetics: Courtesy of the Human Genome Program.
  • Geneaology: GenDocs (UK).
  • Geography: Geographic information systems, cartography, remote sensing.
  • Guatemala: Organizaciones (sociedad civil, etc.) en Guatemala.

  • Health Care: Acronyms found in Australian medical practice.
  • Health Information Resources: Global information and data resources in the health sciences; ou, si l'on prefère, des Ressources d'information sur la santé.
  • Human Rights: And humanitarian organizations (Belair).

  • Incoterms: Con descripciones en español.
  • Indonesia: Words, concepts, and acronyms.
  • Indonesia: ASAP Indonesia.
  • International Affairs: International development acronyms and terminology (USAID).
  • International Affairs: ReliefWeb.
  • International Affairs: International organizations based in Geneva.
  • International Affairs: NGOs at the international level; extensively linked.
  • Ireland: Terms and acronyms, but enough of the latter to make it worthwhile.
  • Ireland: Acronyms associated with the Irish conflict. Comprehensively linked.
  • Ireland: Colour-coded acronyms related to the Irish conflict.
  • Islam: Mulitlateral relations in the Islamic world (Organisation of the Islamic Conference).

  • Journalism: Belair.

  • Languages: Two-letter ISO 639 codes.
  • Latin America: Abbreviations and acronyms used in the Latin American press (FBIS). [Link to zipped PDF]
  • Legal: University of Washington School of Law.
  • Legal: Listado de abreviaturas de la jurisprudencia española.

  • Maritime: The Nautical Institute's guide for mariners.
  • Maritime: Australian Maritime Safety Authority.
  • Medical: Pharmaceutical medicine (Pharma-Lexicon).
  • Medical: US FDA drug approval procedures, regulations, etc.
  • Medical: HIV/AIDS.
  • Medical: Medical abbreviations (with links).
  • Meteorology: Federal Coordinator for Meteorological Services (USA).
  • Mexico: Glosario de siglas mexicanas: gobierno, política, finanzas, etc. (Opaui).
  • Military: Megaterms (22,700 terms and acronyms). Downloadable Windows help file.
  • Military: UK Ministry of Defence.
  • Military: US Department of Defense.
  • Military: Abbreviations of the US Armed Forces.
  • Military: Federation of American Scientists.
  • Military: World War II abbreviations, acronyms, codewords, terms.
  • NASA: An effort to make NASAspeak understandable to the general reader, together with general space-related acronyms.

  • Planning: American Planning Association.
  • Polar Science: Arctic and antarctic! (IASC)
  • Public Broadcasting: From the National Educational Telecommunications Association and Current newspaper.

  • Quality Control: Operations management and quality management.

  • Rice: Rice cultivation, agronomy, the green revolution (IRRI, WARDA, CIAT).

  • Satellites: Earth Observing System Data and Information System.
  • South Africa: Healthcare and social acronyms.
  • Spain: Abbreviations and acronyms used in the Spanish press (FBIS). [Link to zipped PDF]
  • Spanish: Abbreviations and acronyms used in the Spanish-language military and general press (FBIS). [Link to zipped PDF]

  • Telecomunicaciones y Telefonía: Siglas inglesas traducidas y españolas autóctonas.
  • Telecommunications: General telecomms (MIT).
  • Telecommunications: ISDN abbreviations (MIT).
  • Telecommunications: CRAF/ESF: European slant.
  • Trade: Abbreviations used in international trade.
  • Transportation: Bureau of Transportation Statistics (US DOT).

  • UK: Business and professional abbreviations and acronyms.
  • USA: List of US government acronyms.
  • USA: Abbreviations and acronyms of the US government (thoroughly linked).
  • USA: Specific to Alaska (AHFC).
  • USA: Organizational acronyms.
  • USA: Acronyms, abbreviations, initials, and common names of federal political action committees.
  • Coins grading abbreviations

  • Veterinary Medicine: From the Veterinary Medicine Library.

  • Yugoslavia (former): Office of the High Representative in BiH.

  • teenchatdecoder.com: Teen chat room acronym decoder

  • www.calculateme.com

  • TUCAA: The Ultimate Computer Acronyms Archive

  • NoSlang.com

  • Wordsmith.org
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