Proto-Circassian language
Proto-Circassian (or Proto-Adyghe–Kabardian) is the reconstructed common ancestor of the Adyghean and Kabardian languages. == Phonology == Note on Orthography: This article employs Cyrillic characters alongside IPA to assist readers familiar with the Circassian alphabet.
Source: Wikipedia — Proto-Circassian language (CC BY-SA 4.0)