Proto-Hmong–Mien language
Proto-Hmong–Mien (PHM), also known as Proto-Miao–Yao (PMY; Chinese: 原始苗瑶语), is the reconstructed ancestor of the Hmong–Mien languages. Lower-level reconstructions include Proto-Hmongic and Proto-Mienic.
Source: Wikipedia — Proto-Hmong–Mien language (CC BY-SA 4.0)