Assamese language in East Goalpariya and Kamrupi, otherwise used extensively further east. The change of to and then to ; all these have been attributed to Tibeto-Burman influence by Dr. Chatterjee. Assamese, Odia and Bengali, in contrast to other Indo-Aryan languages, use the velar nasal (the English "ng" in "sing") extensively. In many languages, while the velar nasal is commonly restricted to preceding velar sounds, in Assamese it can occur intervocalically. This is another feature it shares with other languages of Northeast India, though in Assamese the velar nasal never occurs word-initially. Eastern Indic languages like Assamese, Bengali, Sylheti, and Odia do
Assamese alphabet said to develop proto-Assamese shapes by the 13th century. In the 18th and 19th century, the Assamese script could be divided into three varieties: "Kaitheli" (also called "Lakhari" in Kamrup region, used by non-Brahmins), "Bamuniya" (used by Brahmins, for Sanskrit) and "Garhgaya" (used by state officials of the Ahom kingdom)—among which the "Kaitheli" style was the most popular, with medieval books (like the "Hastir-vidyrnava") and sattras using this style. In the early part of the 19th century, Atmaram Sarmah designed the first Assamese script for printing in Serampore, and the Bengali and Assamese lithography converged to the present standard that