Lot of 3 coins of the same type. Size is around 16mm-18mm, around 3 grams each:

A standing man holding a Conch on right hand, various dots, crescents and other devices around // A sitting man with Conch on right hand, legend in Nagari Sri Rajaraja. Mitchiner 735ff; Numista 374527; K.Ganesh The coins of Tamil Nadu #1.19 or similar; Zeno 329975.

This denomination is variously given the name "massa", "kahavanu" or "kasu", among others.

This coin was issued under Rajaraja Chola I, a famous Emperor of the Chola dynasty from 985-1014 AD, who controlled parts of the southern India and Sri Lanka. The coin is often called "Octopus Man" because of it's appearance of tentacles.