Subculture
Subcultures can be identified by the members' age, race, ethnicity, social class, location, or gender.  The qualities that distinguish among subcultures may be linguistic, aesthetic, religious, political, sexual, geographical, or a combination of factors.  Members of a subculture often signal each other through the use of fashion style, stereotypical behaviors, and use of a secret language created to prevent outsiders from understanding them (this is known as Argot).  They also live out particular relations to places: Ken Gelder talks about 'subcultural geographies' along these lines.