CI

This article is about uppercase C and uppercase I. For uppercase C and uppercase L, see CL (disambiguation).

CI or Ci may refer to:

Criminology and military

• Counter-intelligence
• Confidential Informant
• Confidential Information
• Crazy Ivan, a U.S. Navy term for a Soviet submarine maneuver
• Compliance Inspection (USAF)
• Chief Inspector, a police rank
• Commander's intent, a summary for orders that expresses the desired result

Finance

• The NYSE symbol for CIGNA Corporation

Locations and continental services

• Ci County, in Hebei, China
• Central Islip, New York
• Cayman Islands
• Chile, FIPS country code and obsolete NATO country code digram
• Cocos Island, off the Republic of Costa Rica
• Coney Island
• Cocos (Keeling) Islands, an external territory of Australia
• Christmas Island, an external territory of Australia
• Kiritimati, another island by the name of "Christmas Island" in the Pacific Ocean
• Côte d'Ivoire, ISO country code digram
  • .ci, the Internet country code top-level domain (ccTLD) for Côte d'Ivoire
• The IATA airline designator for China Airlines (Taiwan ROC)
• Cryonics Institute
• Channel Islands
• Qi, in Tongyong Pinyin
• Carbonia-Iglesias, a province in southern Italy

Medicine

• Cardiac index
• Ci protein, Cubitus interruptus -protein
• Convergence insufficiency
• 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

Philosophy

• Categorical imperative

Politics

• Certificate of identity
• Conservation International
• Civilian Internee, a special status of a prisoner during wartime
• Companion of the Order of the Crown of India, postnominal
• Communist International

Science, technology, and mathematics

• Chemical ionization
• CodeIgniter, a php-framework
• Color index
• Computational intelligence
• Common Interface for a Conditional Access Module.
• CI+, Common Interface Plus
• Continuous integration, a software engineering term.
• Conditional independence, a type of relation of random variables in probability theory.
• Configuration interaction, a post-Hartree-Fock method used in computational chemistry.
• Configuration item, the fundamental structural unit of a configuration management system.
• Confidence interval, an interval estimate of a population parameter used in statistics.
• Conical intersection, the location of a discrete degeneracy between two electronic states.
• Conservation International, an international environmental non-governmental organization.
• Convective instability
• Curie (Symbol: Ci). A measurement of radioactivity named after Marie Curie.
• Cirrus cloud
• Cosine integral (standard mathematical symbols "Ci" and "ci").
• CI group, a type of meteorite.
• Core Image
• 101 in Roman numerals.
• Copenhagen Interpretation, an interpretation of Quantum Mechanics.
• Compound Interest (Mathematics)
• cI protein, a repressor protein of Enterobacteria phage λ
• Cubic inch, a unit of volume used almost exclusively in the United States.
• Cytoplasmic incompatibility, a reproductive system

Television

• Canadian Idol, the Canadian television series.
• Law & Order: Criminal Intent, the television series.
• Crime & Investigation Network (Australia), Australian cable and satellite network focusing on Crime.
• Crime & Investigation Network (UK), United Kingdom cable and satellite network focusing on Crime
• Crime & Investigation Network (USA & Asia)

Other

• Ci, common of Qi (surname) from Tungusic peoples
• Customer Intelligence, a discipline in marketing
• Ci (poetry), a form of Chinese lyric poetry
• Civilian Instructor, an adult volunteer in the British Air Cadet Organisation
• Cycling Ireland
• Competitive intelligence
• Collective intelligence, a subfield of sociology
• China Airlines
• Collegium Invisibile
• Confucius Institute
• Consumers International
• Corporate identity, a concept in marketing
• CI Records, a record label
• Comprehensible Input
• Cambria and Indiana Railroad
• Contact improvisation
• Christian Identity
• Continuous Improvement Process
• Creative Industries