Gyan Mudra / Chin Mudra - gesture of knowledge. It enhances concentration, relieves stress, sharpens the memory, improves sleep & a remedy for mental disorders and depression. The thumb and the index finger joined balances the exchange of energy between our personal world and the greater world around us. The three extended fingers represent the three gunas (motivational forces in life): lethargy, fiery activity, and balance & harmony. The palms facing down strengthens our root system.