

Pure sciences and exact or mathematical sciences, including astronomy, mechanics and mathematical physics.
| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| CIST | Centre d'Information sur les Sciences de la Terre | In French | → Libraries → Earth sciences | 
| CITES | Convention on International Trade in Endangered Species of Wild Fauna and Flora | In English | → International relations → Environmental protection | 
| CITHER | Consultation en Texte Intégral des THèses en Réseau | In French | → Knowledge management → Higher education, universities | 
| CiUO | Circular of the Union Observatory Johannesburg | In English | → Serial publications, periodicals → Astronomy | 
| CJLTP | Chinese Journal of Low Temperature Physics | In English | → Serial publications, periodicals → Physics → China | 
| CJMat | Canadian Journal of Mathematics | In English | → Serial publications, periodicals → Mathematics → Canada | 
| CLA | Conjugated Linoleic Acid | In English | → Biochemistry, biophysics | 
| CLAES | Cryogenic Limb Array Etalon Spectrometer | In English | → Analytical chemistry | 
| CLAMP | Climate Leaf Analysis Multivariate Program | In English | → Meteorology, climatology → Paleobotany, palynology | 
| CLDB | Cell Line Data Base | In English | → Cytology → Biotechnology | 
| ClDy | Climate Dynamics | In English | → Serial publications, periodicals → Meteorology, climatology | 
| CLEAN | Conformité à la Législation Environnementale des Activités Nucléaires | In French | → Software → 5023 → Nuclear technology | 
| CLGE | Comité de Liaison des Géomètres Européens | In French | → Organizations and associations → Geodesy, cartography | 
| CLGE | Council of European Geodetic Surveyors | In English | → Organizations and associations → Geodesy, cartography | 
| CLGE | Central Laboratory of General Ecology | In English | → Research institutes → Ecology | 
| CLIC | Climate and Cryosphere (http://clic.npolar.no) | In English | → Meteorology, climatology → Hydrology | 
| CliPa | Climate of the Past | In English | → Serial publications, periodicals → Meteorology, climatology | 
| CliPD | Climate of the Past Discussions | In English | → Serial publications, periodicals → Meteorology, climatology | 
| CLIVAR | Climate Variability and Predictability (www.clivar.org) | In English | → Meteorology, climatology | 
| CLOUDSAT | Cloud Cover Statistical Analysis Program | In English | → Meteorology, climatology | 
| CLS | Collecte Localisation Satellites | In English | → Astronautics → Earth sciences | 
| CLS | Computational Life Sciences | In English | → Computer-based techniques → Biological sciences | 
| CLSM | Confocal Laser Scanning Microscope/Microscopy = MCBL | Microscope/Microscopie confocal(e) à balayage laser | In French | In English | → Physics | 
| CMA | Chaperone-mediated autophagy | In English | → Biological sciences | 
| CMA | Centre de Mathématiques Appliquées | In French | → Mathematics | 
| CMAME | Computer Methods in Applied Mechanics and Engineering | In English | → Serial publications, periodicals → Computer-based techniques → Mechanics → Mechanical engineering | 
| CMAP | CPC Merged Analysis of Precipitation | In English | → Meteorology, climatology → Hydrology | 
| CMBI | Center for Molecular Biosciences Innsbruck (https://www.uibk.ac.at/cmbi/) | In English | → Research institutes → Biochemistry, biophysics → Austria | 
| CMC | Canadian Meteorological Center | In English | → Research institutes → Meteorology, climatology → Canada | 
| CMCN | Center of Molecular and Cellular Nanostructure | In English | → Biochemistry, biophysics | 
| CMDRG | Cislennye Metody v Dinamike Razrežennyh Gazov | In Russian | → Serial publications, periodicals → Physics | 
| CMDS | Cumbre Mundial sobre el Desarrollo Sostenible = WSSD | World Summit on Sustainable Development | In English = SMDD | Sommet Mondial sur le Développement Durable | In French = CMDS | Cúpula Mundial de Desenvolvimento Sustentável | In Portuguese | In Spanish | → International relations → Environmental protection | 
| CMDS | Cúpula Mundial de Desenvolvimento Sustentável = WSSD, SMDD (look above) | In Portuguese | → International relations → Environmental protection | 
| CME | Coronal Mass Ejection | In English | → Astronomy | 
| CMH | Complexe Majeur d'Histocompatibilité | In French | → Biological sciences → Immunology and allergy | 
| CMI | Clay Mathematics Institute | In English | → Mathematics | 
| CML | Chemical Markup Language | In English | → Programming languages → Chemistry | 
| CMM | Center for Molecular Medicine | In English | → Research institutes → Biochemistry, biophysics → Medicine | 
| CMMPE | Centre of Molecular Materials for Photonics and Electronics | In English | → Research institutes → Optics → Electromagnetism → Mechanical engineering | 
| CMMPh | Computational Mathematics and Mathematical Physics | In English | → Serial publications, periodicals → Mathematics → Physics | 
| CMNUCC | Convenio Marco de las Naciones Unidas sobre Cambio Climático (http://unfccc.int) = UNFCCC | United Nations Framework Convention on Climate Change | In English = CCNUCC | Convention-Cadre des Nations Unies sur les Changements Climatiques | In French = CQNUMC | Convenção-Quadro das Nações Unidas sobre Mudança de Clima | In Portuguese = UNFCCC | 聯合國氣候變化綱要公約 | In Chinese = КИК | Рамочная конвенция ООН об изменении климата | In Russian = UNFCCC | 気候変動枠組条約 | In Japanese = UNFCCC | 기후 변화에 관한 국제 연합 기본 협약 | In Korean | In Spanish | → United Nations → Meteorology, climatology | 
| CMOI | Contrôles et Mesures Optiques pour l'Industrie | In French | → Optics → Engineering, technology | 
| CMP | Cytidine monophosphate | In French | → Genetics → Biochemistry, biophysics | 
| CMPI | Cow's Milk Protein Intolerance | In English | → Nutrition → Proteins | 
| CMPP | Centre Marocain de Production Propre (www.cmpp.ma) | In French | → 5023 → Morocco | 
| CMR | Centro Meteorologico Regionale | In Italian | → Meteorology, climatology | 
| CMT | Continuum Mechanics and Thermodynamics | In English | → Serial publications, periodicals → Mechanics → Thermodynamics | 
| CMV | Cytomegalie-Virus | In German | → Virology → Infectious diseases | 
| CMV | Cytomegalovirus | In German | → Virology → Infectious diseases | 
| CMwA | Computers and Mathematics with Applications | In English | → Serial publications, periodicals → Computer science → Mathematics | 
| CMWCI | Contributions from the Mount Wilson Observatory / Carnegie Institution of Washington | In English | → Serial publications, periodicals → Astronomy → United States | 
| CNACA | Comissão Norte-americana de Cooperação Ambiental (www.cec.org) = CCAAN | Comisión para la Cooperación Ambiental de América del Norte | In Spanish = NACEC | North American Commission for Environmental Cooperation | In English = CNACE | Commission Nord-Américaine de Coopération Environnementale | In French | In Portuguese | → International relations → Environmental protection | 
| CNACE | Commission Nord-Américaine de Coopération Environnementale (www.cec.org) = CNACA, CCAAN, NACEC (look above) | In French | → International relations → Environmental protection | 
| CNAE | Comissão Nacional de Atividades Espaciais | In Portuguese | → Astronomy → Astronautics | 
| CNAP | Catalogue des Normes Anti-Pollution | In French | → Environmental protection | 
| CNCMA | Centro Nazionale di Meteorologia e Climatologia Aeronautica | In Italian | → Central administration → Meteorology, climatology → Aeronautics, aircraft | 
| CNES | Centre National d'Études Spatiales (www.cnes.fr) | In French | → Research institutes → Astronomy → Astronautics → France | 
| CNESER | Conseil National de l'Enseignement Supérieur et de la Recherche | In French | → Education | 
| CNEVA | Centre National d'Études Vétérinaires et Animales | In French | → Zoology → Veterinary medicine | 
| CNEXO | Centre National pour l'Exploitation des Océans | In French | → Marine research, oceanography → Fishing, hunting | 
| CNFME | Centre National de Formation aux Métiers de l'Eau | In French | → Specialized or polytechnical colleges → Hydrology → Environmental technology, water supply, waste management | 
| CNG | Centre National de Génotypage (www.cng.fr) | In French | → Research institutes → Genetics → France | 
| CNME | Communications in Numerical Methods in Engineering | In English | → Serial publications, periodicals → Mathematics → Engineering, technology | 
| CNNMN | Commision on New Minerals and Mineral Names | In English | → Organizations and associations → Mineralogy → Petrology | 
| CNPL | Concurso Nacional de Programação Lógica | In Portuguese | → Programming languages → Algorithms | 
| CNRM | Centre National de Recherche Météorologique | In French | → Meteorology, climatology | 
| CNRS | Centre National de la Recherche Scientifique | In French | → Research policy | 
| CNRST | Centre National pour la Recherche Scientifique et Technique | In French | → Applied sciences, technology | 
| CNS | Central Nervous System | In English | → Biological sciences → Anatomy → Neurology | 
| CNS | Centre National de Séquençage | In French | → Genetics | 
| CNS | Canadian Nuclear Society (www.cns-snc.ca) | In English | → Organizations and associations → Nuclear, atomic, and molecular physics → Nuclear technology → Canada | 
| CNSA | China National Space Administration (www.cnsa.gov.cn) | In English | → Central administration → Astronomy → Astronautics → China | 
| CNSNS | Communications in Nonlinear Science and Numerical Simulations | In English | → Serial publications, periodicals → Mathematics | 
| CNUED | Conférence des Nations Unies sur l'Environnement et le Développement | In French | → Development → United Nations → Environmental protection, | 
| CNV | Copy Number Variant | In English | → Genetics | 
| Co | Cobalt = Co | Kobalt | In Afrikaans = Co | كوبالت | In Arabic = Co | Kobalt | In Azerbaijani = Co | Кобальт | In Belarusian = Co | Кобалт | In Bulgarian = Co | কোবাল্ট | In Bengali = Co | Kobalt | In Bosnian = Co | Cobalt | In Catalan = Co | Cobaltu | In Corsican = Co | Kobalt | In Czech = Co | Кобальт | In Chuvash = Co | Kobolt | In Danish = Co | Cobalt | In German = Co | Κοβάλτιο | In Greek = Co | Cobalt | In English = Co | Kobalto | In Esperanto = Co | Cobalto | In Spanish = Co | Koobalt | In Estonian = Co | Kobalto | In Basque = Co | کبالت | In Persian = Co | Koboltti | In Finnish = Co | Cobalt | In Friulian = Co | Cóbalt | In Irish = Co | Cobalto | In Galician = Co | Cobalt | In Manx = Co | קובלט | In Hebrew = Co | कोबाल्ट | In Hindi = Co | Kobalt | In Croatian = Co | Kobalt | In Hungarian = Co | Կոբալտ | In Armenian = Co | Kobal | In Indonesian = Co | Kobalto | In Ido = Co | Kóbolt | In Icelandic = Co | Cobalto | In Italian = Co | コバルト | In Japanese = Co | ridjinme | In Lojban = Co | ಕೊಬಾಲ್ಟ್ | In Kannada = Co | 코발트 | In Korean = Co | Kobalt | In Kurdish = Co | Cobaltum | In Latin = Co | Kobalt | In Letzeburgesh = Co | Kobaltas | In Lithuanian = Co | Kobalts | In Latvian = Co | Кобалт | In Macedonian = Co | കൊബാള്ട്ട് | In Malayalam = Co | कोबाल्ट | In Marathi = Co | Kobalt | In Low German = Co | Kobalt | In Dutch = Co | Kobolt | In Nynorsk = Co | Kobolt | In Norwegian = Co | Cobalt | In Occitan = Co | Kobalt | In Polish = Co | Cobalto | In Portuguese = Co | Kubaltu | In Quechua = Co | Cobalt | In Romanian = Co | Кобальт | In Russian = Co | Kobalt | In Serbo-Croatian = Co | Kobalt | In Slovak = Co | Kobalt | In Slovenian = Co | Кобалт | In Serbian = Co | Cobalt | In Saterland Frisian = Co | Kobolt | In Swedish = Co | Kobalti | In Swahili = Co | Кобалт | In Tajik = Co | โคบอลต์ | In Thai = Co | Kobalt | In Turkish = Co | Кобальт | In Ukrainian = Co | Kobalt | In Uzbek = Co | Coban | In Vietnamese = Co | 钴 | In Chinese | In French | → Chemistry | 
| Co | Kobalt = (look above) | In Afrikaans | → Chemistry | 
| Co | كوبالت = (look above) | In Arabic | → Chemistry | 
| Co | Kobalt = (look above) | In Azerbaijani | → Chemistry | 
| Co | Кобальт = (look above) | In Belarusian | → Chemistry | 
| Co | Кобалт = (look above) | In Bulgarian | → Chemistry | 
| Co | কোবাল্ট = (look above) | In Bengali | → Chemistry | 
| Co | Kobalt = (look above) | In Bosnian | → Chemistry | 
| Co | Cobalt = (look above) | In Catalan | → Chemistry | 
| Co | Cobaltu = (look above) | In Corsican | → Chemistry | 
| Co | Kobalt = (look above) | In Czech | → Chemistry | 
| Co | Кобальт = (look above) | In Chuvash | → Chemistry | 
| Co | Kobolt = (look above) | In Danish | → Chemistry | 
| Co | Cobalt = (look above) | In German | → Chemistry | 
| Co | Κοβάλτιο = (look above) | In Greek | → Chemistry | 
| Co | Cobalt = (look above) | In English | → Chemistry | 
| Co | Kobalto = (look above) | In Esperanto | → Chemistry | 
| Co | Cobalto = (look above) | In Spanish | → Chemistry | 
| Co | Koobalt = (look above) | In Estonian | → Chemistry | 
| Co | Kobalto = (look above) | In Basque | → Chemistry | 
| Co | کبالت = (look above) | In Persian | → Chemistry | 
| Co | Koboltti = (look above) | In Finnish | → Chemistry | 
| Co | Cobalt = (look above) | In Friulian | → Chemistry | 
| Co | Cóbalt = (look above) | In Irish | → Chemistry | 
| Co | Cobalto = (look above) | In Galician | → Chemistry | 
| Co | Cobalt = (look above) | In Manx | → Chemistry | 
| Co | קובלט = (look above) | In Hebrew | → Chemistry | 
| Co | कोबाल्ट = (look above) | In Hindi | → Chemistry | 
| Co | Kobalt = (look above) | In Croatian | → Chemistry | 
| Co | Kobalt = (look above) | In Hungarian | → Chemistry | 
| Co | Կոբալտ = (look above) | In Armenian | → Chemistry | 
| Co | Kobal = (look above) | In Indonesian | → Chemistry | 
| Co | Kobalto = (look above) | In Ido | → Chemistry | 
| Co | Kóbolt = (look above) | In Icelandic | → Chemistry | 
| Co | Cobalto = (look above) | In Italian | → Chemistry | 
| Co | コバルト = (look above) | In Japanese | → Chemistry | 
| Co | ridjinme = (look above) | In Lojban | → Chemistry | 
| Co | ಕೊಬಾಲ್ಟ್ = (look above) | In Kannada | → Chemistry | 
| Co | 코발트 = (look above) | In Korean | → Chemistry | 
| Co | Kobalt = (look above) | In Kurdish | → Chemistry | 
| Co | Cobaltum = (look above) | In Latin | → Chemistry | 
| Co | Kobalt = (look above) | In Letzeburgesh | → Chemistry | 
| Co | Kobaltas = (look above) | In Lithuanian | → Chemistry | 
| Co | Kobalts = (look above) | In Latvian | → Chemistry | 
| Co | Кобалт = (look above) | In Macedonian | → Chemistry | 
| Co | കൊബാള്ട്ട് = (look above) | In Malayalam | → Chemistry | 
| Co | कोबाल्ट = (look above) | In Marathi | → Chemistry | 
| Co | Kobalt = (look above) | In Low German | → Chemistry | 
| Co | Kobalt = (look above) | In Dutch | → Chemistry | 
| Co | Kobolt = (look above) | In Nynorsk | → Chemistry | 
| Co | Kobolt = (look above) | In Norwegian | → Chemistry | 
| Co | Cobalt = (look above) | In Occitan | → Chemistry | 
| Co | Kobalt = (look above) | In Polish | → Chemistry | 
| Co | Cobalto = (look above) | In Portuguese | → Chemistry | 
| Co | Kubaltu = (look above) | In Quechua | → Chemistry | 
| Co | Cobalt = (look above) | In Romanian | → Chemistry | 
| Co | Кобальт = (look above) | In Russian | → Chemistry | 
| Co | Kobalt = (look above) | In Serbo-Croatian | → Chemistry | 
| Co | Kobalt = (look above) | In Slovak | → Chemistry | 
| Co | Kobalt = (look above) | In Slovenian | → Chemistry | 
| Co | Кобалт = (look above) | In Serbian | → Chemistry | 
| Co | Cobalt = (look above) | In Saterland Frisian | → Chemistry | 
| Co | Kobolt = (look above) | In Swedish | → Chemistry | 
| Co | Kobalti = (look above) | In Swahili | → Chemistry | 
| Co | Кобалт = (look above) | In Tajik | → Chemistry | 
| Co | โคบอลต์ = (look above) | In Thai | → Chemistry | 
| Co | Kobalt = (look above) | In Turkish | → Chemistry | 
| Co | Кобальт = (look above) | In Ukrainian | → Chemistry | 
| Co | Kobalt = (look above) | In Uzbek | → Chemistry | 
| Co | Coban = (look above) | In Vietnamese | → Chemistry | 
| Co | 钴 = (look above) | In Chinese | → Chemistry | 
| CO | Monoxyde de carbone = CO | أول أكسيد الكربون | In Arabic = CO | Monòxid de carboni | In Catalan = CO | Oxid uhelnatý | In Czech = CO | Kulilte | In Danish = CO | Kohlenstoffmonoxid | In German = CO | Carbon monoxide | In English = CO | Karbona monooksido | In Esperanto = CO | Monóxido de carbono | In Spanish = CO | Vingugaas | In Estonian = CO | Karbono monoxido | In Basque = CO | منو اکسید کربن | In Persian = CO | Hiilimonoksidi | In Finnish = CO | Monóxido de carbono | In Galician = CO | Carboan monocseed | In Manx = CO | פחמן חד-חמצני | In Hebrew = CO | Ugljikov monoksid | In Croatian = CO | Wuhlikowy monoksid | In Upper Sorbian = CO | Szén-monoxid | In Hungarian = CO | Karbon monoksida | In Indonesian = CO | Kolmónoxíð | In Icelandic = CO | Monossido di carbonio | In Italian = CO | 一酸化炭素 | In Japanese = CO | 일산화 탄소 | In Korean = CO | Monoxidum Carbonis | In Latin = CO | Anglies monoksidas | In Lithuanian = CO | Oglekļa monoksīds | In Latvian = CO | Јаглерод моноксид | In Macedonian = CO | कार्बन मोनॉक्साईड | In Marathi = CO | Koolstofmonoxide | In Dutch = CO | Karbonmonoksid | In Nynorsk = CO | Karbonmonoksid | In Norwegian = CO | Tlenek węgla | In Polish = CO | Monóxido de carbono | In Portuguese = CO | Monoxid de carbon | In Romanian = CO | Монооксид углерода | In Russian = CO | Oxid uhoľnatý | In Slovak = CO | Ogljikov oksid | In Slovenian = CO | Karbon monoksida | In Sundanese = CO | Kolmonoxid | In Swedish = CO | Karbonmonoksit | In Turkish = CO | Монооксид вуглецю | In Ukrainian = CO | Mônôxít cacbon | In Vietnamese = CO | 一氧化碳 | In Chinese | In French | → Chemistry | 
| CO | أول أكسيد الكربون = (look above) | In Arabic | → Chemistry | 
| CO | Monòxid de carboni = (look above) | In Catalan | → Chemistry | 
| CO | Oxid uhelnatý = (look above) | In Czech | → Chemistry | 
| CO | Kulilte = (look above) | In Danish | → Chemistry | 
| CO | Kohlenstoffmonoxid = (look above) | In German | → Chemistry | 
| CO | Carbon monoxide = (look above) | In English | → Chemistry | 
| CO | Karbona monooksido = (look above) | In Esperanto | → Chemistry | 
| CO | Monóxido de carbono = (look above) | In Spanish | → Chemistry | 
| CO | Vingugaas = (look above) | In Estonian | → Chemistry | 
| CO | Karbono monoxido = (look above) | In Basque | → Chemistry | 
| CO | منو اکسید کربن = (look above) | In Persian | → Chemistry | 
| CO | Hiilimonoksidi = (look above) | In Finnish | → Chemistry | 
| CO | Monóxido de carbono = (look above) | In Galician | → Chemistry | 
| CO | Carboan monocseed = (look above) | In Manx | → Chemistry | 
| CO | פחמן חד-חמצני = (look above) | In Hebrew | → Chemistry | 
| CO | Ugljikov monoksid = (look above) | In Croatian | → Chemistry | 
| CO | Wuhlikowy monoksid = (look above) | In Upper Sorbian | → Chemistry | 
| CO | Szén-monoxid = (look above) | In Hungarian | → Chemistry | 
| CO | Karbon monoksida = (look above) | In Indonesian | → Chemistry | 
| CO | Kolmónoxíð = (look above) | In Icelandic | → Chemistry | 
| CO | Monossido di carbonio = (look above) | In Italian | → Chemistry | 
| CO | 一酸化炭素 = (look above) | In Japanese | → Chemistry | 
| CO | 일산화 탄소 = (look above) | In Korean | → Chemistry | 
| CO | Monoxidum Carbonis = (look above) | In Latin | → Chemistry | 
| CO | Anglies monoksidas = (look above) | In Lithuanian | → Chemistry | 
| CO | Oglekļa monoksīds = (look above) | In Latvian | → Chemistry | 
| CO | Јаглерод моноксид = (look above) | In Macedonian | → Chemistry | 
| CO | कार्बन मोनॉक्साईड = (look above) | In Marathi | → Chemistry | 
| CO | Koolstofmonoxide = (look above) | In Dutch | → Chemistry | 
| CO | Karbonmonoksid = (look above) | In Nynorsk | → Chemistry | 
| CO | Karbonmonoksid = (look above) | In Norwegian | → Chemistry | 
| CO | Tlenek węgla = (look above) | In Polish | → Chemistry | 
| CO | Monóxido de carbono = (look above) | In Portuguese | → Chemistry | 
| CO | Monoxid de carbon = (look above) | In Romanian | → Chemistry | 
| CO | Монооксид углерода = (look above) | In Russian | → Chemistry | 
| CO | Oxid uhoľnatý = (look above) | In Slovak | → Chemistry | 
| CO | Ogljikov oksid = (look above) | In Slovenian | → Chemistry | 
| CO | Karbon monoksida = (look above) | In Sundanese | → Chemistry | 
| CO | Kolmonoxid = (look above) | In Swedish | → Chemistry | 
| CO | Karbonmonoksit = (look above) | In Turkish | → Chemistry | 
| CO | Монооксид вуглецю = (look above) | In Ukrainian | → Chemistry | 
| CO | Mônôxít cacbon = (look above) | In Vietnamese | → Chemistry | 
| CO | 一氧化碳 = (look above) | In Chinese | → Chemistry | 
| COADS | Comprehensive Ocean-Atmosphere Data Set (http://icoads.noaa.gov) | In English | → Marine research, oceanography → Meteorology, climatology | 
| CoAlg | Communications in Algebra | In English | → Serial publications, periodicals → Algebra | 
| COAMPS | Coupled Ocean/Atmospheric Mesoscale Prediction System | In English | → Computer simulation → Marine research, oceanography → Meteorology, climatology | 
| COARE | Coupled Ocean–Atmospheric Response Experiment (www.ncdc.noaa.gov/oa/coare/) | In English | → Marine research, oceanography → Meteorology, climatology | 
| CoArm | Contributions from the Armagh Observatory | In English | → Serial publications, periodicals → Astronomy | 
| CoAsi | Contributions dell'Osservatorio Astrofisica dell'Universita di Padova in Asiago | In Italian | → Serial publications, periodicals → Astronomy | 
| CoASP | Comments on Astrophysics and Space Physics | In English | → Serial publications, periodicals → Astronomy | 
| CoAst | Communications in Asteroseismology | In English | → Serial publications, periodicals → Astronomy → Seismology, earthquakes | 
| CoAth | Contributions from the Research and Computing Center Academy of Sciences of Athens | In English | → Serial publications, periodicals → Astronomy → Greece | 
| COBAE | Comissão Brasileira de Atividades Espaciais | In Portuguese | → Astronomy → Astronautics → Brazil |