平原印第安人手语(英語:Plains Indian Sign Language,PISL;法語:Langue des Signes Indienne des Plaines;西班牙語:Lenguaje de Signos Indio de las Llanuras),又称平原手语、平原手势谈话(Plains
Lakhóta Project University of Colorado Rood, David S., and Taylor, Allan R. (1996). Sketch of Lakhota, a Siouan Language, Part I. Handbook of North American
endonyms; The language in question is actually a language family; The language or community of speakers has a prohibition against writing the language; No documentation