 Unlike most written Yi languages, Nasu proper uses the Pollard (Miao) script.A distinct form of the Yi script was traditionally used for Wusa, though few can still read it.According to the "Guizhou Ethnic Gazetteer" (2002), Yi autonyms include Nasu 哪苏, Tusu 兔苏, Lagou 腊勾, Guo 果, and so forth.