). It also introduces a "natural gender" system where gender is determined by reasoning ability (human vs. non-human). Poruladhikaram (Semantics & Poetics):
The use of the puḷḷi (a diacritical mark for pure consonants), which is a key marker for dating the text. 2. Sollatikaram (Morphology and Syntax) tolkappiyam
It classifies all human emotions into (Akam): tolkappiyam