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
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
Bergsland, Knut(ed.). Aleut Dictionary: Unangam Tunudgusii. Alaska Native Language Center. 1994. ISBN 1-55500-047-9. , at pp. 49(Alaxsxi-x = mainland Alaska)