CI or Ci may refer to:
Business terminology
- Commercial invoice
- Competitive intelligence
- Confidential information
- Continual improvement
- Corporate identity
- Customer intelligence, a discipline in marketing
Businesses and organisations
Academia and education
Religion
- Josephites of Belgium, a Catholic congregation
- Christian Identity
- Christian Institute, a British charity which promotes Christian values
Other businesses and organizations
- Charity Intelligence Canada
- China Airlines (IATA code)
- Cigna health services (NYSE symbol)
- Consumers International
- Cycling Ireland
- CI Records, a music record label
- Cambria and Indiana Railroad
- CANZUK International, organisation which promotes cooperation between Canada, Australia, New Zealand and the United Kingdom
- Conservation International, an international environmental non-governmental organization
- Communications International, a former global union federation
- Communist International
- Children International, a non-profit child sponsorship organization
Law and military
- Counterintelligence
- Confidential informant
- Compliance Inspection, a United States Air Force inspection
- Chief inspector, a police rank
- Circle inspector, a junior police rank
- Certificate of identity
- Civilian Internee, a special status of a prisoner during wartime
- Civilian Instructor, an adult volunteer in the British Air Training Corps
Places
- Ci County, in Hebei, China
- Cayman Islands
- Chile (FIPS country code, obsolete NATO country code)
- Coney Island
- Cocos (Keeling) Islands, an external territory of Australia
- Cook Islands, an island-country in the South Pacific Ocean
- Côte d'Ivoire (ISO country code)
- Channel Islands
- Channel Islands of California
- Carbonia-Iglesias, a province in southern Italy
- Central India, 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, a reproductive system
- Cardiac index
- Ci protein, Cubitus interruptus -protein
- Coital incontinence
- Convergence insufficiency
- Corpulence index
- Cumulative incidence, used as a measure of disease frequency in epidemiology
- Cochlear implant
- Chemical injury syndrome, an increased sensitivity to common chemicals also called multiple chemical sensitivity.
- Chronic illness, a condition that is long-lasting or recurrent
- Contraindication
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
- Configuration item, the fundamental structural unit of a configuration management system
- Core Image, non-destructive image processing technology
- Continuous integration, a software-engineering practice of merging developer code into a main code base frequently
- CodeIgniter, a PHP framework
Earth science
Mathematics
- Conditional independence, a type of relation of random variables in probability theory
- Confidence interval, an interval estimate of a population parameter used in statistics
- 101 (number) (in Roman numerals)
- Compound interest
- Cosine integral (standard mathematical symbols "Ci" and "ci")
Physics
- Conical intersection, 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, a unit of volume
Other uses in science and technology
- CI group, a type of carbonaceous chondrite meteorite
- Carrier interferometry, a radio and optical communication coding technology
- Chemical ionization, 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, 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, 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), a form of Chinese lyric poetry
- Qi, a central concept in several eastern philosophies
- Categorical imperative, in philosophy
- Colour Index International, a reference database
- Comprehensible input
- Contact improvisation, a dance technique
- CI, postnominal for Companion of the Order of the Crown of India
- Ci, a form of the surname Qi, of the Tungusic peoples
See also
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