Megalithic markings, Megalithic graffiti marks, Megalithic symbols or Non-Brahmi symbols are terms used to describe markings found on mostly potsherds found in Central India, South India and Sri Lanka during the Megalithic Iron Age period. They are usually found in burial sites but are also found in habitation sites as well. They are tentatively dated from 1000 BCE to 300 CE marking the transition of the proto-historic period into the historic period of South Asia. A number of scholars have tried to decipher the symbols since 1878, and currently there is no consensus as to whether they constitute undeciphered writing or graffiti or symbols without any syllabic or alphabetic meaning.