 The same sources tell that when the Xiongnu noted down something or transmitted a message, they made cuts on a piece of wood ('ke-mu'), and they also mention a "Hu script".At Noin-Ula and other Xiongnu burial sites in Mongolia and the region north of Lake Baikal, among the objects were discovered over 20 carved characters.Most of these characters are either identical or very similar to letters of the Old Turkic alphabet of the Early Middle Ages found on the Eurasian steppes.