Map showing the extinct and extant signed languages of the United States and Canada at their maximum attested historical ranges, purposefully excluding the dominating languages ASL and LSQ. Other potential languages such as Navajo Sign Language which may be dialects of Plains Sign Talk have been included under the PST umbrella. Plains Sign Talk Inuiuuk (ᐃᓄᐃᐆᒃ) Hawai'i Sign Language Maritime Sign Language Extinct Languages "Plateau Sign Language" "Martha's Vineyard Sign Language" "Henniker Sign Language" "Sandy River Valley Sign Language]"