Grantha

means

a literary work or treatise

or

Grantha Vowels, vocabulary
Grantha Vowels. Image credit.

The Grantha script (Tamil Kiranta eḻuttu, Malayalam Grantha lipi) was widely used between the sixth century and the 20th centuries by Tamil speakers in South India, particularly in Tamil Nadu and Kerala, to write Sanskrit and the classical language Manipravalam, and is still in restricted use in traditional Vedic schools (Sanskrit veda pāṭhaśālā). It is a Brahmic script, having evolved from the Brahmi script in Tamil Nadu. The Malayalam script is a direct descendant of Grantha as are the Tigalari and Sinhala alphabets.

Source: Wikipedia.org.

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