CI or Ci may refer to:

Business terminology

Commercial invoice When used in foreign trade, a commercial invoice is a customs document. It is used as a customs declaration provided by the person or corporation that is exporting an item across international borders. Although there is no standard format, the do ...

Competitive intelligence Competitive intelligence (CI) is the process and forward-looking practices used in producing knowledge about the competitive environment to improve organizational performance. Competitive intelligence involves systematically collecting and anal ...

Confidential information Confidentiality involves a set of rules or a promise sometimes executed through non-disclosure agreement, confidentiality agreements that limits the access to or places restrictions on the distribution of certain types of information. Legal con ...

* Continual improvement *

Corporate identity A corporate identity or corporate image is the manner in which a corporation, firm or business enterprise presents itself to the public. The corporate identity is typically visualized by branding and with the use of trademarks, but it can also i ...

Customer intelligence Customer intelligence (CI) as part of business intelligence is the process of gathering information regarding customers, and their details and activities, to build deeper and more effective customer relationship management, customer relationships ...

, a discipline in marketing

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 Ventura County, California. Located near the city of Camarillo, it opened in 2002 as the 23rd campus in the California State University system ...

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 ...

Collegium Invisibile Collegium Invisibile is an Learned society, academic society founded in 1995 in Warsaw, Poland, Warsaw that affiliates outstanding Polish students in the humanities and science with distinguished scholars in accordance with the idea of a libera ...

Confucius Institute Confucius Institutes (CI; ) are public educational and cultural promotion programs of the state of China. The stated aim of the program is to promote Chinese language and culture, support local Chinese teaching internationally, and facilita ...

Religion

Josephites of Belgium The Institute of the Josephites of Belgium (), commonly called Josephites is a Roman Catholic clerical religious congregation of pontifical right for men devoted to the Christian education of the youth It was founded in Ghent Belgium by Canon van ...

, a Catholic congregation *

Christian Identity Christian Identity (also known as Identity Christianity) is an interpretation of Christianity which advocates the belief that only Celtic and Germanic peoples, such as the Anglo-Saxon, Nordic nations, or the Aryan race and kindred peoples, are ...

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

, a British charity which promotes Christian values

Other businesses and organizations

CI Financial CI Financial is a Canadian investment management company based in Toronto, Ontario. It offers investment management and wealth management services targeted to high net worth retail investors, as well as brokerage and trading services to portfol ...

, Canadian investment management company *

Charity Intelligence Canada Charity Intelligence Canada is a Toronto-based nonprofit organization which posts assessments of the finances and impacts of Canadian charities on its website. Founded in 2007 by former equity analyst Kate Bahen, using unconventional methodolo ...

China Airlines China Airlines (CAL; zh, t=中華航空, poj=Tiong-hôa Hâng-khong, p=Zhōnghuá Hángkōng, first=t, c=, s=) is the state-owned flag carrier of the Taiwan, Republic of China (Taiwan). It is one of Taiwan's two major airlines, along with E ...

(IATA code) *

Cigna The Cigna Group is an American multinational for-profit managed healthcare and insurance company based in Bloomfield, Connecticut. Its insurance subsidiaries are major providers of medical, dental, disability, life and accident insurance and r ...

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 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 Federation. CI is a member of the U ...

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. Weiss also operates the physical record sto ...

, a music record label * Cambria and Indiana Railroad *

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 int ...

, 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, Virginia, in Arlington County, Virginia. CI's work focuses on science, policy and partnership with businesses, governments and co ...

, 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 The Communist International, abbreviated as Comintern and also known as the Third International, was a political international which existed from 1919 to 1943 and advocated world communism. Emerging from the collapse of the Second Internationa ...

Children International Children International is a global nonprofit humanitarian organization that helps children break the cycle of poverty. It addresses children’s critical needs through early intervention and regular interaction in community centers. The goal is t ...

, a non-profit child sponsorship organization *

Cryonics Institute The Cryonics Institute (CI) is an American nonprofit foundation that provides cryonics services. CI freezes deceased humans and pets in liquid nitrogen with the hope of restoring them with technology in the future. History The Cryonics Institut ...

, American nonprofit foundation

Law and military

Counterintelligence Counterintelligence (counter-intelligence) or counterespionage (counter-espionage) is any activity aimed at protecting an agency's Intelligence agency, intelligence program from an opposition's intelligence service. It includes gathering informati ...

Confidential informant An informant (also called an informer or, as a slang term, a "snitch", "rat", "canary", "stool pigeon", "stoolie", "tout" or "grass", among other terms) is a person who provides privileged information, or (usually damaging) information inten ...

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 healt ...

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

Circle inspector Inspector, also police inspector or inspector of police, is a police rank. The rank or position varies in seniority depending on the organization that uses it. Australia The rank of Inspector is present in all Australian police forces excep ...

, a junior police rank * Certificate of identity *

Civilian Internee A civilian internee is a civilian detained by a belligerent to a war for security reasons. Internees are usually forced to reside in internment camps. Historical examples include Internment of Japanese Americans, internment of Japanese and Internme ...

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

Air Training Corps The Air Training Corps (ATC) is a British Youth organisations in the United Kingdom, volunteer youth organisation; aligned to, and fostering the knowledge and learning of military values, primarily focusing on military aviation. Part of the ...

and Canada Air Cadets

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 Territories, British Overseas Territory, and the largest by population. The territory comprises the three islands of Grand Cayman, Cayman Brac and Little Cayman, which are located so ...

Chile Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...

(FIPS country code, obsolete NATO country code) *

Coney Island Coney Island is a neighborhood and entertainment area in the southwestern section of the New York City borough of Brooklyn. The neighborhood is bounded by Brighton Beach to its east, Lower New York Bay to the south and west, and Gravesend to ...

Cocos (Keeling) Islands The Cocos (Keeling) Islands (), officially the Territory of Cocos (Keeling) Islands (; ), are an Australian external territory in the Indian Ocean, comprising a small archipelago approximately midway between Australia and Sri Lanka and rel ...

, an external territory of Australia *

Cook Islands The Cook Islands is an island country in Polynesia, part of Oceania in the South Pacific Ocean. It consists of 15 islands whose total land area is approximately . The Cook Islands' Exclusive Economic Zone (EEZ) covers of ocean. Avarua is its ...

, an island-country in the South Pacific Ocean *

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

(ISO country code) *

Channel Islands The Channel Islands are an archipelago in the English Channel, off the French coast of Normandy. They are divided into two Crown Dependencies: the Jersey, Bailiwick of Jersey, which is the largest of the islands; and the Bailiwick of Guernsey, ...

Channel Islands of California The Channel Islands () are an eight-island archipelago located within the Southern California Bight in the Pacific Ocean, off the coast of California. They define the Santa Barbara Channel between the islands and the California mainland. The ...

* Carbonia-Iglesias, a province in southern Italy *

Central India Central India refers to a geographical region of India that generally includes the states of Chhattisgarh and Madhya Pradesh. The Central Zonal Council, established by the Government of India, includes these states as well as Uttar Prades ...

, region of India, abbreviated CI ** Central India Circuit or C. I. Circuit, a Hindi film distribution circuit comprising parts of Madhya Pradesh (Indian state within central India)

Science, technology and mathematics

Biology and medicine

* cI protein, a repressor protein of ''Enterobacteria phage λ'' *

Cytoplasmic incompatibility Cytoplasmic incompatibility (CI) is a mating incompatibility reported in many arthropod species that is caused by intracellular parasites such as ''Wolbachia''. These bacteria reside in the cytoplasm of the host cells (hence the name ''cytoplasmic ...

, a reproductive system * Cardiac index * Ci protein, Cubitus interruptus -protein * Coital incontinence *

Convergence insufficiency Convergence insufficiency is a sensory and neuromuscular anomaly of the binocular vision system, characterized by a reduced ability of the Human eyes, eyes to turn towards each other, or sustain Convergence (eye), convergence. Symptoms The sympto ...

* Corpulence index *

Cumulative incidence In epidemiology, incidence reflects the number of new cases of a given medical condition in a population within a specified period of time. Incidence proportion Incidence proportion (IP), also known as cumulative incidence, is defined as the p ...

, used as a measure of disease frequency in epidemiology *

Cochlear implant A cochlear implant (CI) is a surgically implanted Neuroprosthetics, neuroprosthesis that provides a person who has moderate-to-profound sensorineural hearing loss with sound perception. With the help of therapy, cochlear implants may allow for imp ...

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

Chronic illness A chronic condition (also known as chronic disease or chronic illness) 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 ...

, a condition that is long-lasting or recurrent *

Contraindication In medicine, a contraindication is a condition (a situation or factor) that serves as a reason not to take a certain medical treatment due to the harm that it would cause the patient. Contraindication is the opposite of indication, which is a rea ...

Computing

* .ci, the Internet country code top-level domain (ccTLD) for Côte d'Ivoire * Common Interface, for a Conditional Access Module ** CI+, Common Interface Plus *

Computational intelligence In computer science, computational intelligence (CI) refers to concepts, paradigms, algorithms and implementations of systems that are designed to show " intelligent" behavior in complex and changing environments. These systems are aimed at m ...

Configuration item The term configuration item (CI) refers to the fundamental structural unit of a configuration management system. Examples of CIs include individual hardware or software components. The configuration-management system oversees the life of the CIs t ...

, 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 Continuous integration (CI) is the practice of integrating source code changes frequently and ensuring that the integrated codebase is in a workable state. Typically, developers Merge (version control), merge changes to an Branching (revisio ...

, a software-engineering practice of merging developer code into a main code base frequently * CodeIgniter, a PHP framework

Earth science

Cirrus cloud Cirrus ( cloud classification symbol: Ci) is a genus of high cloud made of ice crystals. Cirrus clouds typically appear delicate and wispy with white strands. In the Earth's atmosphere, cirrus are usually formed when warm, dry air rises, causing ...

Convective instability In meteorology, convective instability or stability of an air mass refers to its ability to resist vertical motion. A ''stable'' atmosphere makes vertical movement difficult, and small vertical disturbances dampen out and disappear. In an ''uns ...

Mathematics

Conditional independence In probability theory, conditional independence describes situations wherein an observation is irrelevant or redundant when evaluating the certainty of a hypothesis. Conditional independence is usually formulated in terms of conditional probabi ...

, a type of relation of random variables in probability theory * Confidence interval, an interval estimate of a population parameter used in statistics *

101 (number) 101 (one hundred ndone) is the umberfollowing 100 and preceding 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 ordinal number, 101st (one hundred ndf ...

(in Roman numerals) *

Compound interest Compound interest is interest accumulated from a principal sum and previously accumulated interest. It is the result of reinvesting or retaining interest that would otherwise be paid out, or of the accumulation of debts from a borrower. Compo ...

* Cosine integral (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) The curie (symbol Ci) is a non- SI unit of radioactivity originally defined in 1910. According to a notice in ''Nature'' at the time, it was to be named in honour of Pierre Curie, but was considered at least by some to be in honour of Marie Skł ...

(Symbol: Ci), a measurement of radioactivity named after Marie Curie *

Copenhagen interpretation The Copenhagen interpretation is a collection of views about the meaning of quantum mechanics, stemming from the work of Niels Bohr, Werner Heisenberg, Max Born, and others. While "Copenhagen" refers to the Danish city, the use as an "interpretat ...

, 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 propo ...

meteorite *

Carrier interferometry Carrier Interferometry (CI) is a spread spectrum scheme designed to be used in an Orthogonal frequency-division multiplexing, Orthogonal Frequency-Division Multiplexing (OFDM) communication system for multiplexing and multiple access, enabling the ...

, a radio and optical communication coding technology *

Chemical ionization Chemical ionization (CI) is a ionization, 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 molec ...

, a technique used in mass spectrometry *

Configuration interaction Configuration interaction (CI) is a post-Hartree–Fock linear variational method for solving the nonrelativistic Schrödinger equation within the Born–Oppenheimer approximation for a quantum chemical multi-electron system. Mathemati ...

, a post-Hartree–Fock method used in computational chemistry *

Contextual inquiry Contextual inquiry (CI) is a user-centered design (UCD) research method, part of the contextual design methodology. A contextual inquiry interview is usually structured as an approximately two-hour, one-on-one interaction in which the researcher w ...

, a user-centered design research method *

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

, a subfield of sociology * Colour Index International, a reference database of CI numbers for dyes and pigments * Bavarian C I, a steam locomotive with the Royal Bavarian State Railways * Compression ignition engine, 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 Do ...

'', a Canadian television series * '' Law & Order: Criminal Intent'', an American television series * Crime & Investigation Network ** 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)

Other uses

Ci (poetry) ''Cí'' (pronounced ; zh, t=詞), also known as ''chángduǎnjù'' ( zh, t=長短句, s=长短句, l=lines of irregular lengths, first=t, labels=no) and ''shīyú'' ( zh, t=詩餘, s=诗馀, l=the poetry besides Shi, first=t, labels=no), is a t ...

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

Categorical imperative The categorical imperative () is the central philosophical concept in the deontological Kantian ethics, moral philosophy of Immanuel Kant. Introduced in Kant's 1785 ''Groundwork of the Metaphysics of Morals'', it is a way of evaluating motivati ...

, in philosophy * Colour Index International, 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 Contact Improvisation (CI) is a postmodern dance practice that explores movement through shared weight, touch, and physical awareness. Originating in the United States in 1972, contact improvisation was developed by dancer and choreographer Steve ...

, 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. Th ...

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