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
over Northern School Segregation, 1865–1954. New York, NY: Cambridge University Press. 2005. ISBN 978-0521607834. Hill, Joseph. 2015. Language attitudes
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