(British spelling) Any system where colours are used to categorize elements of sets.

(computing) Any character used to specify a function of a piece of software or hardware (such as carriage return of a printer)

(business, espionage, military) A name used to clandestinely identify somebody or something, either for military or espionage purposes, or for commercial confidentiality.

(programming) A block of source code, often one that is delimited by brackets or in some similar way, depending on the programming language.

(ethics) A written, formal, and consistent set of rules prescribing righteous behavior, accepted by a person or by a group of people.

A set of building and property regulations designed to establish a mandatory standard for a building's ability to resist the start and spread of a fire as well as facilitating the prompt and safe evacuation of the occupants.

A mandatory set of rules on building design, construction, testing, inspection, and maintenance to protect public health, safety, and welfare.

(computing) Source code that relates to an obsolete operating system or other obsolete technology.

To mark using a bio-code.

A biochemical signal or marker, especially one used for security purposes. / A signal consisting of a biological action.