nabho mudra

Turn the underside of the tongue up; press it against the hard palate; extend the tip of the tongue back towards the soft palate; and retain the breath in the lungs. This "tongue lock" technique should be practiced as a true bandha by pressing the tongue firmly up and back. When performed in this manner, nabho mudra immediately suppresses spurious self-talk, internal dialog, and mind chatter. It is used in place of kechari mudra, as it does not require cutting the frenulum linguae. For more information, see kechari mudra and sambhavi mudra.