(Main list of acronyms) c – (s) Centi C – (s) Carbon – Coulomb – One Hundred (in Roman numerals) C0–9 C2 or C2 – (i) Command and Control c2c – (s) the British rail company formerly known as LTS Rail C2C (p) Coast to Coast Athletic Conference Consumer-To-Consumer electronic commerce Cam-To-Cam internet chat C2D or C2D – (i) Intel Core 2 Duo C2IEDM or C2IEDM – (i) Command and Control Information Exchange Data Model C2IS or C2IS – (i) Command and Control Information System C2PC or C2PC – (i) Command and Control Personal Computer C2V or C2V – (i) Command and Control Vehicle C2W or C2W – (i) Command and Control Warfare C3 or C3 (i) Colorectal Cancer Condition Command, Control, and Communications C3I or C3I – (i) Command, Control, Communications, and Intelligence C4 or C4 – (i) Command, Control, Communications, and Computers C4I or C4I – (i) Command, Control, Communications, Computers, and Intelligence C4ISR or C4ISR – (i) Command, Control, Communications, Computers, Intelligence, Surveillance and Reconnaissance CA ca – (s) Catalan language (ISO 639-1 code) Ca – (s) Calcium CA (s) California (postal symbol) Canada (FIPS 10-4 country code; ISO 3166 digram) Catalonia (i) Civil Affairs Close Armour Cocaine Anonymous Computer Associates Counter-Air Cricket Australia CAA (i) Canadian Automobile Association (NORAD) Center for Aerospace Analysis (U.S.) Center for Army Analysis (U.S.) Clean Air Act (U.S. Army) Concepts Analysis Agency Civil Aviation Authority Colonial Athletic Association CAAT (i) or (a) Campaign Against Arms Trade Center for Alternatives to Animal Testing CAC (i) California Association of Criminalists Chronic Asymptomatic [Disease] Carrier CACM (i) Central American Common Market (i) Communications of the ACM CAD (s) Canadian dollar (ISO 4217 currency code) (a) Computer-Aided Design Computer-Aided Dispatch Cpplint Anxiety Disorder - (a) Condition suffered by software developers who worry about whether they've left any whitespace on the end of a line CADCAM – (a) Computer-Aided Design/Computer-Aided Manufacturing CADMID – (a) Concept, Assessment, Demonstration, Manufacture, In service, Disposal (life cycle mnemonic) CADPAT – (p) CAnadian Disruptive PATtern CADT – Child/Adolescent Day Treatment CAE (i) Canadian Aviation Electronics (originally) Certificate in Advanced English CAEn – (i/a) Close Action Engagement (constructive simulation) CAF (s) Central African Republic (ISO 3166 trigram) (i) Confederation of African Football (or French Confédération Africaine de Football) CAFAD – (a) Combined Arms For Air Defence CAFDE (a) Canadian Association of Film Distributors and Exporters Computer Aided Federation Development Environment CAFE –