Plateau Sign Language

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Plateau Sign Language
Native to Canada, USA
Region Columbia Plateau
Extinct 18th century
contact pidgin
Language codes
ISO 639-3 None (mis)
Glottolog None

Plateau Sign Language, or Old Plateau Sign Language, is a poorly attested sign language historically used in British Columbia. It is not clear if it was a regional variant of Plains Standard Sign Language, the contact pidgin of the Great Plains, or a separate trade language indigenous to the Columbian Plateau. The Crow Nation introduced Plains Standard, which replaced Plateau Sign among the eastern nations that used it (the Coeur d’Alene, Sanpoil, Okanagan, Thompson, Lakes, Shuswap, and Coleville), with western nations[which?] shifting instead to Chinook Jargon.

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