classified as either laghu (light) or guru (heavy). This classification is based on a matra (literally, "count, measure, duration"), and typically a syllable that ends in a short vowel is a light syllable, while those that end in consonant, anusvara or visarga are heavy. The classical Sanskrit found in Hindu scriptures such as the Bhagavad Gita and many texts are so arranged that the light and heavy syllables in them follow a rhythm, though not necessarily a rhyme. Sanskrit metres include those based on a fixed number of syllables per verse, and those based on fixed number of morae per verse. The Vedic Sanskrit employs fifteen metres, of which seven are common, and the most frequent are three (8-, 11- and 12-syllable lines). The Classical Sanskrit deploys both linear and non-linear metres, many of which are based on syllables and others based on diligently crafted verses based on repeating numbers of morae (matra per foot). Metre and rhythm is an important part of the Sanskrit language. It may have played a role in helping preserve the integrity of the message and Sanskrit texts. The verse perfection in the Vedic texts such as the verse Upanishads and post-Vedic Smṛti texts are rich in prosody. This feature of the Sanskrit language led some Indologists from the 19th century onwards to identify suspected portions of texts where a line or sections are off the expected metre. The metre-feature of the Sanskrit language embeds another layer of communication to the listener or reader. A change in metres has been a tool of literary architecture and an embedded code to inform the reciter and audience that it marks the end of a section or chapter. Each section or chapter of these texts uses identical metres, rhythmically presenting their ideas and making it easier to remember, recall and check for accuracy. Authors coded a hymn's end by frequently using a verse of a metre different than that used in the hymn's body. However, Hindu tradition does not use the Gayatri metre to end a hymn or composition, possibly because it has enjoyed a special level of reverence in Hinduism. Writing system The early history of writing Sanskrit and other languages in ancient India is a problematic topic despite a century of scholarship, states Richard Salomon – an epigraphist and Indologist specializing in Sanskrit and Pali literature. The earliest possible script from South Asia is from the