Unwritten languages

Such as....?

Well some languages are only unwritten for any of their speakers that are illiterate. Almost all of the thousands of native languages of the two Americas were unwritten at the time of European contact with them. In my neck of the woods, there was Miwok (both Coastal and Sierran), Wappo, Pomo, Ohlone, et al. There was a lot of work to transcribe these languages done in the second half of the 20th century as a way to preserve them.

Ceci n'est pas un seing.