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Reference.org
Plateau Sign Language
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<p>Plateau Sign Language, or Old Plateau Sign Language, is a poorly attested, extinct <a href="/facts/Sign_language/Wjfl9Db6">sign language</a> historically used across the <a href="/facts/Columbian_Plateau/GENPnXvM">Columbian Plateau</a>. The <a href="/facts/Crow_Tribe/fp6KctEH">Crow Tribe</a> introduced <a href="/facts/Plains_Indian_Sign_Language/jLj5z6xE">Plains Sign Talk</a>, 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[<i>which?</i>] shifting instead to <a href="/facts/Chinook_Jargon/U398dXF0">Chinook Jargon</a>. </p>