In this chapter we present the concept of a meta set, which is an alternative to a fuzzy set [6]. Similarly to fuzzy sets, the meta sets are meant to describe and represent imprecise data or collections. However, meta sets are better fitted within the classical set theory. In particular, "elements' of meta sets are also meta sets. The language of meta sets resembles the language of the Zermelo–Fraenkel set theory [2] (ZFC) and many properties of crisp sets are reflected in the meta sets theory.