The two-faced Rudraksha – which looks like two semi-circular bead joined – is called Gowri-Shankara or Shiva-Parvati or Ardhanarisvara and falls in the rare category. The three-faced bead named after the Trimurtis is another Rudraksha in the rare category. The rarest of all Rudraksha beads is the single-faced or ek-mukhi. It represents Brahman or Supreme Truth.
Legend has it that single-faced Rudrakshas are produced in sets of three. One disappears, one goes underground and one remains on earth. There are two single-faced in the famous
The different attributes of the Rudraksha faces are mentioned in the Rudraksha Jabalopanishad.