A code is a rule for converting a piece of information into another object or action, not necessarily of the same sort. Code may also refer to: Computing Code (metadata), data elements whose allowable values can be represented as enumerated lists Code point, in numerical value used in character encoding Code.org, a non-profit organization and website that encourages U.S. school students to learn computer science Coding theory, branch of mathematics and computer science dealing with data transmission Computer code, set of instructions forming a computer program which is executed by a computer. Machine code, a sequence of instructions to a processor unit Source code, a sequence of instructions written in some human-readable computer programming language , an HTML element Science and technology Code (coding theory), a subset of cardinality at least two of a Hamming space Code (cryptography), device for hiding the meaning of a message Code (semiotics), device to carry information in a verbal and/or nonverbal form Code (set theory), set with a particular isomorphism to another set Barcode, an optical, machine-readable representation of a numeric code that identifies the object to which it is attached Baudot code, used in telegraphy Diagnosis code, used to translate medical conditions into statistical codes, also used for the purpose of health care planning and reimbursement Encoding (memory), storage and recalling of information by organisms Genetic code, a correspondence between the structures of messenger RNA and proteins Hospital emergency codes, used in hospitals worldwide to alert staff to various emergencies Morse code, a method with which humans can transmit letters using only short and long pulses Nomenclature codes, rulebooks of scientific naming convention Serial code or serial number Society and law Code (law), body of law written and enforced by a sovereign state Legal code (municipal), a body of law written by a regional or local governmental entity, such as a U.S. state, a Canadian province, a German Bundesland, or a municipality Building code, set of rules that specify the minimum standards for constructed objects Code name, a word or name used to refer to another name, word, project or person Ethical code, adopted by a profession, by a governmental or quasi-governmental organ, or by a trade group or other organization Code Parish in Latvia Arts, entertainment, and media Films The Code (2001 film), 2001 Linux documentary The Code (2002 film), French film Thick as Thieves (2009 film) or The Code, 2009 heist