Very secret mudras in Yoga

Sit in Sukhasana and Fix your sight on the anterior part of the nose, with eyes half closed. Breathe and exhale with producing a sound Humming Bee 

This mudra can help you to the realization of self.

Note: To perform this mudra you should consult an expert.

I think this mudra is helpful for you.Also, read my book "Complete Hand Mudras." It will give you more information about mudras read