Shiva Nataraja is one of the three most importants figures of Hinduism. This statue is strongly influenced by the Samkhya philosophy. So He has humans proportions, although the four arms.
With the right back arm Shiva play the dhamaru, a little drum. The left back hand holds the fire, a symbol of Shiva. A cobra makes him company. He has a japamala on His neck and several props. He is fighting against the little - but powerful - devil Avidya, that represents ignorance.