Knotted string communication is called "khipu" (or "quipu"). It was an ancient Inca method of record-keeping and communication that used variously colored strings and knots to convey information, such as numerical data and possibly narrative content. Khipus served as a sophisticated system for managing administrative and economic records in the Inca Empire.
macrame
String can be reused if it is in good condition and not too tangled or knotted.
Macrame
Jute is a strong, heavy fiber-like string, which comes in a loosely coiled roll called a skein. When the string comes loose from the roll, it can become knotted and tangled.
Quipus, also spelled khipus or quipu, are knotted cords used by the Inca civilization in South America as a method of record-keeping and communication. The position, color, and type of knots on the strings conveyed information such as numbers, dates, and events.
The Incas didn't have a written script but used a complicated system of knotted cords called, 'Quipu' for communicating.
Quipu or khipu (sometimes called talking knots) were recording devices used in the Inca Empire and its predecessor societies in the Andean region.
TAT
It's called a quipa
According to a Minnesota State University web page the answer is No the Inca had no written language but did have ways of record keeping using knotted strings.
knotted
they were used for a counting system