Kāraṇa Mudrā

Demon-Quelling Gesture
 Kāraṇa Mudrā
    qīkè yìn 期克印
    This gesture subdues negativity, including demons, negative thoughts, illness, and all other obstacles. It consists of holding up the hand, with the two middle fingers folded back into the palm and held by the thumb. In art it occurs in scenes of active conquest of demons. (Since there are a lot of demons in movies, you will see it there quite often.)
    (The Chinese name qīkè yìn 期克印, seems also to be used sometimes for the Warning Gesture or Tarjanī Mudrā.)

Source

anthro.ucsd.edu