Santali language
Santali India, Bangladesh, Bhutan as well as Nepal, devloping it a third most-spoken Austroasiatic Linguistic communication after Vietnamese & Khmer.
Santali was the mainly oral Linguistic communication until the development of Ol Chiki by Pandit Raghunath Murmu in 1925. Ol Chiki is alphabetic, sharing none of the syllabic properties of the other Indic scripts, and is now widely used to write Santali in India.