 Most of Yi people of the Luquan area do not have the autonym Luoluo and Nasu (transliterated into Chinese as 纳苏) means "black", hence the Black Yi (黑彝 Hei Yi), though Black Yi is an aristocratic caste distinction among the Yi People, and Black Yi Script (Heiyiwen) was a Latin script for Yi introduced by missionaries.Chen, et al.