Dhyana Mudra.

This mudra signifies meditation. Both hands are in the lap with palms upward. The right hand is on top of the left hand. The Buddha is most seated in the half-lotus posture (sometimes called 'yoga', 'Indian', 'Buddha' posture). Some images display the Buddha in the so-called adamantine (diamond, or full-lotus) posture with tightly crossed legs, so that the soles of both feet are visible.
The Bodhisattva makes a vow and is determined not the leave the spot (where he is sitting on the grass) until he achieves enlightenment. The Boddhisattva determines to find the cause of suffering and its cessation.