A quipu, or knot-record (also called chip), was a method used by the Incas and other ancient Andean cultures to keep records and communicate information. In the absence of an alphabetic writing system, this simple and highly portable device achieved a surprising degree of precision and flexibility.
Explanation:
The Inca did not have any alphabetic writing to fulfill the purpose of communication and store knowledge. What they did make use of was the Quipu system, a simple and very mobile system that has striking capacities to store various data.
It's a bit different because while the Nubians kept the culture, they developed their own language. Unlike them, the Bantu people retained their language, but they developed their culture further.
