Yukaghir birch-bark carvings

The Yukaghir birch-bark carvings, known in the Yukaghir language as tos (meaning "birch bark"), were traditionally made by Yukaghir people of Siberia on birch bark for various purposes such as mapping, record-keeping, and party games. The symbols were inscribed on the inner side of the birch bark using the sharp end of a knife.