Meme

From the Wikipedia article at http://en.wikipedia.org/wiki/Meme

"The term "meme", coined in 1976 by Richard Dawkins, refers to a replicator of cultural information that one mind transmits (verbally or by demonstration) to another mind. Dawkins said, Examples of memes are tunes, catch-phrases, clothes fashions, ways of making pots or of building arches. Other examples include deities, concepts, ideas, theories, opinions, beliefs, practices, habits, dances and moods which propagate within a culture. A meme propagates itself as a unit of cultural evolution analogous in many ways to the gene (the unit of genetic information"

The study of memes and their transmission is the subject of Memetics