Hmong is a Hmong-Mien language spoken by about 2.6 million people in China, Vietnam, Laos, Thailand, USA, and French Guiana. There are two major varieties of Hmong: White Hmong (Hmoob Dawb) and Green/Blue Hmong (Moob Leeg/Hmoob Ntsuab), which are named after the traditional colours worn by women of the different groups.
In China Hmong is known as Miao and is written with Chinese characters or with an alphabet known as Pollard Miao. In Thailand, it is written with the Thai alphabet. In Vietnam Hmong is sometimes written with the Pahawh Hmong alphabet. During the 1980s and 1990s several other alphabets were invented to write Hmong: Ntawv Paj Ntaub, based on Thai letters and Chinese characters, and Ai Ao Lo.