Tibetan Thangka Depicting Buddhas

Middle- vitarka mudra: gesture of discussion & debate, indicates communication & explanation of the dharma.
right- abhaya mudra: protection, reassurance, peace, dispelling fear.
left- dharmahakra mudra: teaching the wheel of dharma. one of the most important moments in the life of Buddha when he preached to his companions the first sermon after his enlightenment.