quipu

An information device used in the Incan Empire and other ancient Andean cultures in which colored, knotted strings were used to record numbers and categories of things and narrative accounts. (Also spelled khipu). Web resource here.

quipuQuipu from Ayacucho, Peru. Cotton. 1300-1532 CE. Museo Arqueológico Rafael Larco Herrera, Lima, Perú.