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 Coleville), with western nations^[which?] shifting instead to Chinook Jargon.

This article does not cite any sources. (April 2022)

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
Language family	contact pidgin
Writing system	none
Language codes
ISO 639-3	None (mis)
Glottolog	None
Attested historical range of Plateau Sign Language among other sign languages in the US and Canada (excl. ASL and LSQ).

Further reading

• "Sign Language Among North American Indians Compared With That Among Other Peoples And Deaf-Mutes," First Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1879-1880, Government Printing Office, Washington, 1881, pages 263-552
• Clark, William Philo. 1885. The Indian Sign Language

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На других языках

[fr] Langue des signes du Plateau