This is Vishnu sleeping on Sesha, the five-hooded cobra.
Out of Vishnu’s navel emanates lotus stem and on the lotus flower is Brahma.
The stem is bent and Brahma is against Vishnu’s left thigh. Sri Devi/Lakshmi is sitting at Vishnu’s feet.
Note the damage to Lakshmi, her head is missing.
A very rare icon. It is from Tamil Nadu.
It is about 5 inches/ 12.5 cm long.