CI or Ci may refer to:

Business terminology

* Customer intelligence, a discipline in marketing *

Competitive intelligence Competitive intelligence (CI) is the process and forward-looking practices used in producing knowledge about the competitive environment to improve organizational performance. It involves the systematic collection and analysis of information from ...

* Corporate identity *

Continual improvement A continual improvement process, also often called a continuous improvement process (abbreviated as CIP or CI), is an ongoing effort to improve products, services, or processes. These efforts can seek "incremental" improvement over time or "breakth ...

* Confidential information

Businesses and organisations

Academia and education

California State University, Channel Islands California State University Channel Islands (CSUCI, CSU Channel Islands) is a public university in Camarillo, California. It opened in 2002 as the 23rd campus in the California State University system. CSUCI is located on the Central Coast of Cal ...

Channel Islands High School Channel Islands High School (CIHS) is a secondary school located in Oxnard, California, United States. The school is part of the Oxnard Union High School District. CIHS had a student population of 2,596 during the 2018–19 school year. History C ...

Collegium Invisibile Collegium Invisibile is an academic society founded in 1995 in Warsaw that affiliates outstanding Polish students in the humanities and science with distinguished scholars in accordance with the idea of a liberal education. The association aim ...

* Confucius Institute

Religion

Josephites of Belgium The Institute of the Josephites of Belgium ( la, Institutum Iosephitarum Gerardimontensium), commonly called Josephites is a Roman Catholic clerical religious congregation of pontifical right for men devoted to the Christian education of the youth ...

, a Catholic congregation * Christian Identity *

Christian Institute The Christian Institute (CI) is a pressure group operating in the United Kingdom, promoting a fundamentalist Christian viewpoint, founded on a belief in Biblical inerrancy. The CI is a registered charity. The group does not report numbers of staf ...

, a British charity which promotes Christian values

Other businesses and organizations

Charity Intelligence Canada Charity Intelligence Canada (Ci) is a registered charity that does charity assessments of over 750 Canadian charitable organizations, to allow donors be informed when they donate to charities, and to promote transparency, accountability, and re ...

* China Airlines (IATA code) *

Cigna Cigna is an American multinational managed healthcare and insurance company based in Bloomfield, Connecticut. Its insurance subsidiaries are major providers of medical, dental, disability, life and accident insurance and related products and se ...

health services (NYSE symbol) *

Consumers International Consumers International is the membership organization for consumer groups around the world. Founded on 1 April 1960, it has over 250 member organizations in 120 countries. Its head office is situated in London, England, and has numerous region ...

Cycling Ireland Cycling Ireland ( ga, Rothaíocht Éireann) or CI is the operating name of the national governing body of the sport of cycling in the island of Ireland. Formally the body is a charitable company limited by guarantee, the Irish Cycling Federat ...

CI Records CI Records is an independent record label in Lancaster, Pennsylvania owned by Jeremy Weiss. Originally created to distribute the releases of his band, Stand Up, an early 1990s melodic hardcore band, CI expanded to include releases from bands suc ...

, a music record label *

Cambria and Indiana Railroad The Cambria and Indiana Railroad (C&I) is a railway company that is located in the southeastern part of Indiana County, Pennsylvania in the United States. Incorporated in 1904 and built in 1910 with the intention of carrying lumber, coal was di ...

CANZUK International CANZUK International is an international advocacy organisation which aims to achieve the free movement of citizens, free trade agreements and foreign policy cooperation between Canada, Australia, New Zealand and the United Kingdom through i ...

, organisation which promotes cooperation between Canada, Australia, New Zealand and the United Kingdom *

Conservation International Conservation International (CI) is an American nonprofit environmental organization headquartered in Crystal City, Arlington, Virginia. CI's work focuses on science, policy and partnership with businesses, governments and communities. The organ ...

, an international environmental non-governmental organization *

Communications International The Postal, Telegraph and Telephone International (PTTI) was a global union federation bringing together unions of communications workers worldwide. History While a meeting of unions of communication workers was held in Paris in 1911, no lasting ...

, a former global union federation * Communist International * Children International, a non-profit child sponsorship organization

Law and military

* Counterintelligence *

Confidential informant An informant (also called an informer or, as a slang term, a “snitch”) is a person who provides privileged information about a person or organization to an agency. The term is usually used within the law-enforcement world, where informan ...

Compliance Inspection Unit Compliance Inspection (UCI) is a United States Air Force inspection conducted to assess areas mandated by law, as well as mission areas identified by senior Air Force and Major Command (MAJCOM) leadership as critical or important to the health ...

, a United States Air Force inspection * Chief inspector, a police rank *

Certificate of identity A certificate of identity, sometimes called an alien's passport, is a travel document issued by a country to non-citizens (also called aliens) residing within their borders who are stateless persons or otherwise unable to obtain a passport fro ...

Civilian Internee A civilian internee is a civilian detained by a party to a war for security reasons. Internees are usually forced to reside in internment camps. Historical examples include Japanese American internment and internment of German Americans in the Unit ...

, a special status of a prisoner during wartime * Civilian Instructor, an adult volunteer in the British Air Training Corps

Places

Ci County Ci County or Cixian () is a county of Hebei, China. It is under the administration of Handan City. Administrative Divisions Towns: * Cizhou (), Xiguanglu (), Gaoyu (), Yuecheng (), Guantai (), Lintan (), Huangsha (), Baitu (), Jiangwucheng ...

, in Hebei, China *

Cayman Islands The Cayman Islands () is a self-governing British Overseas Territory—the largest by population in the western Caribbean Sea. The territory comprises the three islands of Grand Cayman, Cayman Brac and Little Cayman, which are located to the ...

Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...

(FIPS country code, obsolete NATO country code) *

Coney Island Coney Island is a peninsular neighborhood and entertainment area in the southwestern section of the New York City borough of Brooklyn. The neighborhood is bounded by Brighton Beach and Manhattan Beach, Brooklyn, Manhattan Beach to its east, L ...

* Cocos (Keeling) Islands, an external territory of Australia *

Côte d'Ivoire Ivory Coast, also known as Côte d'Ivoire, officially the Republic of Côte d'Ivoire, is a country on the southern coast of West Africa. Its capital is Yamoussoukro, in the centre of the country, while its largest city and economic centre is ...

(ISO country code) *

Channel Islands The Channel Islands ( nrf, Îles d'la Manche; french: îles Anglo-Normandes or ''îles de la Manche'') are an archipelago in the English Channel, off the French coast of Normandy. They include two Crown Dependencies: the Bailiwick of Jersey, ...

* Channel Islands of California *

Carbonia-Iglesias The province of Carbonia-Iglesias (, ) was a provinces of Italy, province in the autonomous region of Sardinia, Italy. It included the historical area of Sulcis-Iglesiente and it was the smallest province of Sardinia. It is bordered by the provinces ...

, a province in southern Italy

Science, technology and mathematics

Biology and medicine

cI protein Ci protein, short for Cubitus interruptus, is a zinc finger containing transcription factor involved in the Hedgehog signaling pathway. In the absence of a signal to the Hedgehog signaling pathway, the Ci protein is cleaved and destroyed in prote ...

, a repressor protein of ''Enterobacteria phage λ'' * Cytoplasmic incompatibility, a reproductive system *

Cardiac index Cardiac index (CI) is a haemodynamic parameter that relates the cardiac output (CO) from left ventricle in one minute to body surface area (BSA), thus relating heart performance to the size of the individual. The unit of measurement is litres per mi ...

Ci protein Ci protein, short for Cubitus interruptus, is a zinc finger containing transcription factor involved in the Hedgehog signaling pathway. In the absence of a signal to the Hedgehog signaling pathway, the Ci protein is cleaved and destroyed in prote ...

, Cubitus interruptus -protein *

Coital incontinence Coital incontinence (CI) is urinary leakage that occurs during either penetration or orgasm Orgasm (from Greek , ; "excitement, swelling") or sexual climax is the sudden discharge of accumulated sexual excitement during the sexual respon ...

Convergence insufficiency Convergence insufficiency is a sensory and neuromuscular anomaly of the binocular vision system, characterized by a reduced ability of the eyes to turn towards each other, or sustain convergence. Symptoms The symptoms and signs associated with con ...

Corpulence index The Corpulence Index (CI) (also Ponderal Index (PI) or Rohrer's Index) is a measure of obesity, corpulence, or of leanness in other variants, of a person''Foods and Nutrition Encyclopedia'', Audrey H. Ensminger, Marion Eugene Ensminger. p. 1645 ca ...

Cumulative incidence In epidemiology, incidence is a measure of the probability of occurrence of a given medical condition in a population within a specified period of time. Although sometimes loosely expressed simply as the number of new cases during some time peri ...

, used as a measure of disease frequency in epidemiology * Cochlear implant *

Chemical injury syndrome Multiple chemical sensitivity (MCS), also known as idiopathic environmental intolerances (IEI), is an unrecognized and controversial diagnosis characterized by chronic symptoms attributed to exposure to low levels of commonly used chemicals. Symp ...

, an increased sensitivity to common chemicals also called multiple chemical sensitivity. *

Chronic illness A chronic condition is a health condition or disease that is persistent or otherwise long-lasting in its effects or a disease that comes with time. The term ''chronic'' is often applied when the course of the disease lasts for more than three mo ...

, a condition that is long-lasting or recurrent * Contraindication

Computing

.ci .ci is the Internet country code top-level domain (ccTLD) for Côte d'Ivoire Ivory Coast, also known as Côte d'Ivoire, officially the Republic of Côte d'Ivoire, is a country on the southern coast of West Africa. Its capital is Yamousso ...

, the Internet country code top-level domain (ccTLD) for Côte d'Ivoire *

Common Interface In Digital Video Broadcasting, the Common Interface (also called DVB-CI) is a technology which allows decryption of pay TV channels. Pay TV stations want to choose which encryption method to use. The Common Interface allows TV manufacturers to ...

, for a Conditional Access Module ** CI+, Common Interface Plus * Computational intelligence * Configuration item, the fundamental structural unit of a configuration management system *

Core Image Core Image is a pixel-accurate, near-realtime, non-destructive image processing technology in Mac OS X. Implemented as part of the QuartzCore framework of Mac OS X 10.4 and later, Core Image provides a plugin-based architecture for applying filt ...

, non-destructive image processing technology * Continuous integration, a software-engineering practice of merging developer code into a main code base frequently *

CodeIgniter CodeIgniter is an open-source software rapid development web framework, for use in building dynamic web sites with PHP. Popularity CodeIgniter is loosely based on the popular model–view–controller (MVC) development pattern. While controller c ...

, a PHP framework

Earth science

* Cirrus cloud * Convective instability

Mathematics

* Conditional independence, a type of relation of random variables in probability theory *

Confidence interval In frequentist statistics, a confidence interval (CI) is a range of estimates for an unknown parameter. A confidence interval is computed at a designated ''confidence level''; the 95% confidence level is most common, but other levels, such as 9 ...

, an interval estimate of a population parameter used in statistics *

101 (number) 101 (one hundred ndone) is the natural number following 100 (number), 100 and preceding 102 (number), 102. It is variously pronounced "one hundred and one" / "a hundred and one", "one hundred one" / "a hundred one", and "one oh one". As an Or ...

(in Roman numerals) * Compound interest *

Cosine integral In mathematics, trigonometric integrals are a family of integrals involving trigonometric functions. Sine integral The different sine integral definitions are \operatorname(x) = \int_0^x\frac\,dt \operatorname(x) = -\int_x^\infty\frac ...

(standard mathematical symbols "Ci" and "ci")

Physics

Conical intersection In quantum chemistry, a conical intersection of two or more potential energy surfaces is the set of molecular geometry points where the potential energy surfaces are degenerate (intersect) and the non-adiabatic couplings between these states are ...

, the location of a discrete degeneracy between two electronic states * Curie (unit) (Symbol: Ci), a measurement of radioactivity named after Marie Curie * Copenhagen interpretation, an interpretation of quantum mechanics *

Cubic inch The cubic inch (symbol in3) is a unit of volume in the Imperial units and United States customary units systems. It is the volume of a cube with each of its three dimensions (length, width, and height) being one inch long which is equivalent ...

, a unit of volume

Other uses in science and technology

* CI group, a type of

carbonaceous chondrite Carbonaceous chondrites or C chondrites are a class of chondritic meteorites comprising at least 8 known groups and many ungrouped meteorites. They include some of the most primitive known meteorites. The C chondrites represent only a small prop ...

meteorite * Carrier interferometry, a radio and optical communication coding technology *

Chemical ionization Chemical ionization (CI) is a soft ionization technique used in mass spectrometry. This was first introduced by Burnaby Munson and Frank H. Field in 1966. This technique is a branch of gaseous ion-molecule chemistry. Reagent gas molecules (often ...

, a technique used in mass spectrometry * Configuration interaction, a post-Hartree–Fock method used in computational chemistry * Contextual inquiry, a user-centered design research method *

Collective intelligence Collective intelligence (CI) is shared or group intelligence (GI) that emerges from the collaboration, collective efforts, and competition of many individuals and appears in consensus decision making. The term appears in sociobiology, politic ...

, a subfield of sociology *

Colour Index International Colour Index International is a reference database jointly maintained by the Society of Dyers and Colourists and the American Association of Textile Chemists and Colorists. It currently contains over 27,000 individual products listed under 13,00 ...

, a reference database of CI numbers for dyes and pigments *

Bavarian C I Bavarian C Is were steam locomotives with the Royal Bavarian State Railways (''Königlich Bayerische Staatsbahn''). They were the first six-coupled engines in Kingdom of Bavaria, Bavaria and were developed specially for the route between Neuenma ...

, a steam locomotive with the Royal Bavarian State Railways *

Compression ignition engine Compression may refer to: Physical science * Compression (physics), size reduction due to forces *Compression member, a structural element such as a column *Compressibility, susceptibility to compression *Gas compression * Compression ratio, of a ...

, another name for a diesel engine

Television

* ''

Canadian Idol ''Canadian Idol'' is a Canadian reality television competition show which aired on CTV, based on the British show ''Pop Idol''. The show was a competition to find the most talented young singer in Canada, and was hosted by Ben Mulroney. Jon Dore ...

'', a Canadian television series * ''

Law & Order: Criminal Intent ''Law & Order: Criminal Intent'' is an American police procedural drama television series set in New York City, where it was also primarily produced. Created and produced by Dick Wolf and René Balcer, the series premiered on September 30, 20 ...

'', an American television series *

Crime & Investigation Network Crime & Investigation (stylized as Crime + Investigation) is an American pay television channel owned by A&E Networks, a joint venture between the Hearst Communications and the Disney Media Networks division of The Walt Disney Company. The cha ...

** Crime & Investigation Network (Australia), Australian cable and satellite network focusing on Crime ** Crime & Investigation Network (Europe), a pan-European television channel **

Crime & Investigation Network (South East Asia) Crime & Investigation Network (also known on promotions as "CI" and branded on-air and stylized as "Crime + Investigation") is a Southeast Asian pay television channel which focuses on crime, investigation and mystery programming. It is run by A+E ...

Other uses

Ci (poetry) CI or Ci may refer to: Business terminology * Customer intelligence, a discipline in marketing * Competitive intelligence * Corporate identity * Continual improvement * Confidential information Businesses and organisations Academia and education ...

, a form of Chinese lyric poetry * Qi, a central concept in several eastern philosophies * Categorical imperative, in philosophy *

, a reference database *

Comprehensible input The input hypothesis, also known as the monitor model, is a group of five hypotheses of second-language acquisition developed by the linguist Stephen Krashen in the 1970s and 1980s. Krashen originally formulated the input hypothesis as just on ...

* Contact improvisation, a dance technique * CI, postnominal for Companion of the

Order of the Crown of India The Imperial Order of the Crown of India is an order in the Orders, decorations, and medals of the United Kingdom, British honours system. The Order was established by Queen Victoria when she became Emperor of India, Empress of India in 1878. The ...

* Ci, a form of the surname Qi, of the Tungusic peoples