Tamil-Brahmi, also known as Tamili or Damili, was a variant of the Brahmi script in southern India. It was used to write inscriptions in Old Tamil. The Tamil-Brahmi script has been paleographically and stratigraphically dated between the third century BCE and the first century CE, and it constitutes the earliest known writing system evidenced in many parts of Tamil Nadu, Kerala, Karnataka, Andhra Pradesh and Sri Lanka. Tamil Brahmi inscriptions have been found on cave entrances, stone beds, potsherds, jar burials, coins, seals, and rings.
Tamil Brahmi resembles but differs in several minor ways from the Brahmi inscriptions found elsewhere on the Indian subcontinent such as the Edicts of Ashoka found in Andhra Pradesh. It adds diacritics to several letters for sounds not found in Prakrit, producing ṉ ṟ ṛ ḷ. Secondly, in many of the inscriptions the inherent vowel has been discarded: A consonant written without diacritics represents the consonant alone, whereas the Ashokan diacritic for long ā is used for both ā and short a in Tamil-Brahmi. This is unique to Tamil-Brahmi and Bhattiprolu among the early Indian scripts. Tamil-Brahmi does not, however, share the odd forms of letters such as gh in Bhattiprolu. This appears to be an adaptation to Dravidian phonotactics, where words commonly end in consonants, as opposed to Prakrit, where this never occurs. According to Mahadevan, in the earliest stages of the script the inherent vowel was either abandoned, as above, or the bare consonant was ambiguous as to whether it implied a short a or not. Later stages of Tamil Brahmi returned to the inherent vowel that was the norm in ancient India.
