Shanka mudra

• 
  
  Shanka is the Indain term for a conch.
• When this mudra is performed, the hands resemble a conch.
  
  Method: first, clench the left thumb with right fingers.
• Now, Place the left fingers on the back of the right palm.
• Finally, join the tips of the right thumb and the left index finger.
  
  Effects: The thumb which represents the element fire, is encircled (and thereby subdued) by the fingers.