Topic summary
Andean civilization

Extracted from the Wikipedia article Andean civilizations.
Uniqueness
Andean civilization lacked several characteristics distinguishing it from the pristine civilizations in the Old World and from the Mesoamerican cultures. First, and perhaps most important, Andean civilizations did not have a written language. Instead, their societies used the quipu, a system of knotted and colored strings, to convey information. Few quipus survive and they have not yet been fully deciphered. Scholars differ on whether the knotted cords of the quipu were able only to record numerical data or could also be used for narrative communication, a true system of writing. If it is true writing, it is still unique because it is not a set of symbols, but rather knotted strings. The use of the quipu dates back at least to the Wari Empire (600–1000 CE) and possibly to the much earlier civilization of Caral/Norte Chico of the third millennium BCE.