Plateau Sign Language, or Old Plateau Sign Language, is a poorly attested, extinct sign language historically used across the Columbian Plateau. The Crow Nation 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[which?] shifting instead to Chinook Jargon.[1]
| Plateau Sign Language | |
|---|---|
| Langue des Signes du Plateau (in the Canadian province of Québec) | |
| Native to | Canada, United States |
| Region | Columbia Plateau |
| Ethnicity | Various First Nations and Native Americans of the Columbia Plateau region |
| Extinct | 18th century |
contact pidgin | |
| none | |
| Language codes | |
| ISO 639-3 | None (mis) |
| Glottolog | None |
| |
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