From Indus Valley to coastal Tamil Nadu T.S. Subramanian Strong resemblances between graffiti symbols in Tamil Nadu and the Indus script Continuity of tradition: Megalithic pots with arrow-work graffiti found at Sembiankandiyur village in Nagapattinam district. CHENNAI: In recent excavations in Nagapattinam district in Tamil Nadu, megalithic pottery with graffiti symbols that have a strong resemblance to a sign in the Indus script have been found. Indus script expert Iravatham Mahadevan says that what is striking about the arrow-mark graffiti on the megalithic pottery found at Sembiyankandiyur and Melaperumpallam villages is that they are always incised twice and together, just...