Ic

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

Science and technology

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
• I_C, or collector current, in bipolar junction transistors
• Ice I_c, 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
• Interchange (road), is abbreviated as IC in Japan and Korea

Other technologies

• ic, a unit of length in the CSS standard equal to the advance measure of the 水 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

Organizations

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

• Canary Islands (ISO 3166-1 code: IC)
• I C, a 2022 short film by Danish filmmaker Helene Moltke-Leth
• IC codes, police shorthand expressions for apparent ethnicity
• Identity card
• Incident commander, person responsible for all aspects of an emergency response
• Independent contractor
• Infinite Craft, a video game by Neal Agarwal
• Internal control, in accounting
• Intimacy coordinator, staff member on theater, film and television productions
• Irish Cup, football cup competition in Northern Ireland