It means ‘Turning the Wheel of the Dharma or Law’, i.e., setting into motion the wheel of Dharma
This Mudra involves both hands.
The right hand is held at chest level with the palm facing outwards. A mystic circle is formed by joining the tips of the index finger and the thumb. The left hand is turned inward and the index finger and thumb of this hand join to touch the right hand’s circle.
