Answer:
Quipu
Step-by-step explanation:
In the Incas language, Quechua, Quipu meant knots.
The Incas did not have written language so, they developed a unique form record keeping and documentation. This form of record-keeping is known as Quipu.
Quipu was invented by Andean American Culture. In this, different colors of strings are used to refer to different things. The codes and numbers were encoded with a string. The string used in Quipu was of cotton fiber.
Incas used this form language to maintain the records, collecting data, dates information or calendars, etc.
So, the correct answer is Quipu.