# 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 (IC$_{50}$)
* 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

### 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

* 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
* 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
* Canary Islands (ISO 3166-1 code: IC)