unknowns

/AH0 N OW1 N Z/
noun
  1. 1

    A variable (usually x, y or z) whose value is to be found.

  2. 2

    Any thing, place, or situation about which nothing is known; an unknown fact or piece of information.

  3. 3

    A person of no identity; a nonentity

Source: https://en.wiktionary.org/wiki/unknown, https://en.wiktionary.org/wiki/unknowns