Yellow Knives (noun) a tribe of Red Savages which inhabits the Barrens.
"It is unusual, is it not, for the Dust Legs to be on the rampage?" I asked. I had understood them to be one of the most peaceful of the tribes of the Barrens. Indeed, they often acted as intermediaries between the men of the settlements and the wilder tribes of the interior, such as the Yellow Knives, the Sleen and Kaiila.
Book 17, Savages of Gor: Page 148