Ic

IC, Ic, ic, or i.c. may stand for:

Astronomy

 * Index Catalogue, a nebula and other object catalogue used in astronomy
 * Type Ic supernova, a subtype of Type I supernova

Biology and medicine

 * Inferior colliculus, a part of the midbrain
 * Informed consent, in clinical trials, a form that has to be signed by the patient before entering a study
 * Intensive care medicine
 * Intermittent catheterisation, a method of relieving the bladder
 * Interstitial cystitis, a disease
 * Inhibitory Concentration, as in half maximal inhibitory concentration (IC50)
 * Inspiratory capacity, a measure of lung volumes
 * Irreducible complexity, a creationist argument

Computing

 * Index of coincidence, in cryptography
 * Integrated circuit, a set of electronic circuits on a semiconductor chip
 * Interactive C, a programming language for robotic controllers
 * Interconnection, physical linking of a telecommunication carrier's network

Economics

 * Indifference curve, in economics
 * Information coefficient, in economics

Physics and chemistry

 * -ic, a suffix describing oxidation state in the IUPAC nomenclature of inorganic chemistry
 * IC, or collector current, in bipolar junction transistors
 * Ice Ic, a metastable cubic crystalline variant of ice
 * Ion chromatography
 * Ionization chamber, a type of radiation detector

Vehicles

 * IC Bus, a bus manufacturer
 * Impuls IC, a German hang glider design
 * International Canoe, a powerful and fast single-handed sailing canoe

Other technologies

 * ic, a unit of length in the CSS standard equal to the advance measure of the ideograph
 * Interchangeable core, a type of lock cylinder
 * Isolation condenser, a passive cooling system for boiling water nuclear reactors

Language

 * -ić or -ič, a family name suffix in South Slavic languages
 * i.c., an abbreviation for the Latin phrase in casu, meaning 'in this case'
 * ic, an Old English pronoun
 * A Christogram, a series of letters that form the abbreviated name of Jesus Christ
 * An independent clause in the study of grammar

Schools

 * Illinois College, Jacksonville, Illinois, US
 * Imperial College London, UK
 * International College, Beirut, Lebanon
 * Ithaca College, Ithaca, New York, US

Other organizations

 * Industry Canada, a division of the Canadian government
 * Ingobamakhosi Carbineers, an infantry regiment of the South African Army
 * United States Intelligence Community, a group of government agencies
 * InterContinental, a hotel chain, or its parent company InterContinental Hotels Group
 * Iron Cross (Burmese band)
 * IC, postnominal letters for a member of the Rosminians, officially the Institute of Charity

Transportation

 * Illinois Central Railroad (reporting mark IC)
 * Indian Airlines (IATA airline designator IC)
 * Intercités, classic long-distance passenger day and night train services in France operated by SNCF
 * InterCity, certain long-distance passenger train services in Europe

Other uses

 * IC codes, police shorthand expressions for apparent ethnicity
 * Identity card
 * Incident commander, person responsible for all aspects of an emergency response
 * Independent contractor
 * Individual contributor, a business role for an employee without management responsibilities
 * Internal control, in accounting
 * Intimacy coordinator, staff member on theater, film and television productions
 * Canary Islands (ISO 3166-1 code: IC)