Noun
the branch of Shiism noted for its esoteric philosophy
Source: WordNetAfter the death or Occultation of Muhammad ibn Ismaill in the 8th century, the teachings of Ismailism further transformed into the belief system as it is known today, with an explicit concentration on the deeper, esoteric meaning ( bāṭin ) of the faith. Source: Internet
When in 411 AH (1021) his mule returned without him, soaked in blood, a religious group that was forming in his lifetime broke off from mainstream Ismailism and did not acknowledge his successor. Source: Internet