Records dating to the 1800s pointing to a sign language on the Hawaiian Islands . That might mean tapping into a well-established language , like ASL or International Sign Language , or finding some other way to get a point across . But the unique language has n't been documented until now , by other researchers . A professor says at least 90 % of its features are distinct from American Sign Language .
Records dating to the 1800s pointing to a sign language on the Hawaiian Islands . But the unique language has n't been documented until now , by other researchers . A professor says at least 90 % of its features are distinct from American Sign Language .