Plateau Sign Language, or Old Plateau Sign Language, is a poorly attested, extinct
sign language
Sign languages (also known as signed languages) are languages that use the visual-manual modality to convey meaning, instead of spoken words. Sign languages are expressed through manual articulation in combination with #Non-manual elements, no ...
historically used across the
Columbian Plateau. The
Crow Tribe introduced
Plains Sign Talk, which replaced Plateau Sign Language among the eastern nations that used it (the Coeur d’Alene, Sanpoil, Okanagan, Thompson, Lakes, Shuswap, and Colville), with western nations shifting instead to
Chinook Jargon
Chinook Jargon (' or ', also known simply as ''Chinook'' or ''Jargon'') is a language originating as a pidgin language, pidgin trade language in the Pacific Northwest. It spread during the 19th century from the lower Columbia River, first to othe ...
.
Further reading
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References
Non-deaf sign languages
North America Native-based pidgins and creoles
Interlinguistics
First Nations languages in Canada
Sign languages of Canada
Languages extinct in the 18th century
18th-century disestablishments in North America
Extinct languages of North America
Sign languages of the United States
Extinct sign languages
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