With of or modifying word. The body of rules or principles followed by a particular group of persons, or recognized in a particular craft…

any (unwritten) set of rules, customs, or principles regulating the behaviour of a particular group of people; cf. honour, n. 2a honour code, n. 1.

a set of principles; a (notional) set of rules and guidelines which outline the responsibilities of, or agreed standards of behaviour for, an…

Any (unwritten) set of rules, customs, or principles among a particular group of people (often those otherwise considered to be unprincipled); = code…