This posture is symbolic of a particular myth of Anjaneya (later known as Hanuman). He was an incarnation of the Lord Shiva. As a young child, he was captivated by what he thought was a giant, glowing fruit in the sky, which was actually the sun.
One day he reached for the fruit and leapt up into the sky to eat it. Surya, the sun god, saw this creature coming towards him, called for Indra, the king of gods, to protect him. Indra struck Anjaneya down with lightning. The bolt hit Anjaneya’s jaw and killed him.