The Indus script, also known as the Harappan script and the Indus Valley Script, is a corpus of symbols produced by the Indus Valley Civilisation. Most inscriptions containing these symbols are extremely short, making it difficult to judge whether or not they constituted a writing system used to record a Harappan language, any of which are yet to be identified. Despite many attempts, the "script" has not yet been deciphered, but efforts are ongoing. There is no known bilingual inscription to help decipher the script, which shows no significant changes over time. However, some of the syntax (if that is what it may be termed) varies depending upon location.
The first publication of a seal with Harappan symbols dates to 1875, in a drawing by Alexander Cunningham. By 1992, an estimated 4,000 inscribed objects had been discovered, some as far afield as Mesopotamia due to existing Indus–Mesopotamia relations, with over 400 distinct signs represented across known inscriptions.
Some scholars, such as G. R. Hunter, S. R. Rao, John Newberry, and Krishna Rao have argued that the Brahmi script has some connection with the Indus system. Raymond Allchin has somewhat cautiously supported the possibility of the Brahmi script being influenced by the Indus script. Another possibility for the continuity of the Indus tradition is in the megalithic graffiti symbols of southern and central India and Sri Lanka, which probably do not constitute a linguistic script but may have some overlap with the Indus symbol inventory. Linguists such as Iravatham Mahadevan, Kamil Zvelebil, and Asko Parpola have argued that the script had a relation to a Dravidian language.
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