The most commonly used script for Tamil is Tamil script, also known as Grantha script. It is an abugida, meaning that each consonant has an inherent vowel sound.
There are other scripts used for writing Tamil, but they are less common:
* Vatteluttu was an ancient Tamil script used before the adoption of Grantha script.
* Brahmi script was used to write Tamil in ancient inscriptions.
Therefore, the "lipi" of Tamil refers to the Tamil script, which is the primary writing system for the language.