Denomination

Noun

1. The act of naming or designating.
2. That by which anything is denominated or styled; an epithet; a name, designation, or title; especially, a general name indicating a class of like individuals.
3. A class, or society of individuals, called by the same name; a subdivision of a religion.

   "She follows the Ahmadiyya denomination of Islam."

4. A unit in a series of units of weight, money, etc.

   "What denomination is that money? They are all 50 euro notes."