| [[Quipu]] - A knotted string used for counting by ancestors to the Tiwanaku people of the Andes Mountains of South America.<ref>{{cite web|url=http://www.computerhistory.org/storageengine/tiwanaku-pottery-depicts-quipu-storage-device/|title=400: Tiwanaku pottery depicts quipu storage device|publisher=Computer History Museum|quote=The oldest known quipu made about 4,600 years ago at Caral on the Peruvian coast.}}</ref>
