Vyuha

Vishnu is said to have manifested Himself in the Pancha-Vyuha forms—

1. Sankarshana in the east, 
2. Prad-yumna in the south, 
3. Aniruadha in the west, 
4. Samban alias Purushottama in the north, and 
5. Vasudeva in the centre. 

The sculptures of all these deities are found in the garbhagriha.

https://www.google.com/search?q=Nachiyar+Kovil