It is a Mudra of emptiness or heaven, which reduces the space element in the body. One hour of this Mudra, if done regularly, can reduce ear pain and watering of the eyes. It improves hearing, strengthens the bones, reduces heart diseases and throat problems. It heals thyroid diseases and fortifies the gums. It also opens the heart chakra and helps in meditation.
How to do it:
Sit comfortably and bend the middle finger in a way that it is kept at the base of the thumb. Then press the first phalanx bone of the middle finger with the tip of the thumb so that pressure is exerted, while the other three fingers are kept straight and stretched. You can practice this Mudra for fifteen minutes, three times a day to get good results.