Santali is the most widely spoken language of the Munda subfamily of the Austroasiatic languages, related to Ho and Mundari, spoken mainly in the Indian states of Assam, Bihar, Jharkhand, Mizoram, Odisha, Tripura and West Bengal. It is a recognized regional language of India per the Eighth Schedule of the Indian Constitution. It is spoken by around 7.6 million people in India, Bangladesh, Bhutan and Nepal, making it the third most-spoken Austroasiatic language after Vietnamese and Khmer. Santali was a mainly oral language until the development of Ol Chiki by Pandit Raghunath Murmu in 1925. Ol Chiki is an alphabetic script, sharing none of the syllabic properties of the other Indic scripts, and is now widely used to write Santali language in India. Before the invention of Ol Chiki script Santali language was used to be written in Roman/latin, Devanagari and Kalinga script.