Old Tamil is the period of the Tamil language spanning the 3rd century BC to the 8th century AD. The earliest records in Old Tamil are short inscriptions from between the 3rd and 2nd century BC in caves and on pottery. These inscriptions are written in a variant of the Brahmi script called Tamil Brahmi. The earliest long text in Old Tamil is the Tolkāppiyam, an early work on Tamil grammar and poetics, whose oldest layers could be as old as the 1st century BC. A large number of literary works in Old Tamil have also survived. These include a corpus of 2,381 poems collectively known as Sangam literature. These poems are usually dated to between the 1st and 5th centuries AD, which makes them the oldest extant body of secular literature in India. Other literary works in Old Tamil include Thiruk