From The Art and Popular Culture Encyclopedia
"Thus the norm has a history much like that of an article of common law: it is an accumulation of decisions made by the community over a long period of time which gradually gathers enough moral influence to serve as a precedent for future decisions." --"Notes on the Sociology of Deviance" (1962) by Kai T. Erikson
In sociology, a norm, or social norm, is a rule that is socially enforced. Social sanctioning is what distinguishes norms from other cultural products or social constructions such as meaning and values. Norms and normlessness are thought to affect a wide variety of human behavior.