The Incas had no writing, but they recorded numbers and information with knots on cords called quipus.
Why it is true
A quipu had a main cord with dozens or hundreds of strings hanging from it. The type and position of each knot showed numbers in base ten, and colours helped to tell subjects apart. They were used for censuses, taxes and storehouses.
Source: Smithsonian National Museum of the American Indian
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