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microculture

n. A very small (niche) culture.

Wikipedia
Microculture

Microculture refers to the specialised subgroups, marked with their own languages, ethos and rule expectations, that permeate differentiated industrial societies.

A microculture depends on the smallest units of organisation – dyads, groups, or local communities – as opposed to the broader subcultures of race or class, and the wider national/global culture, compared to which they tend also to be more short-lived, as well as voluntarily chosen. The study of kinesics – the nonverbal behavior of the small gathering – can be used to illuminate the dynamics of a given microculture.