Quipus or khipus were recording devices used in the Inca Empire

Inca Empire

The Inca Empire, or Inka Empire , was the largest empire in pre-Columbian America. The administrative, political and military center of the empire was located in Cusco in modern-day Peru. The Inca civilization arose from the highlands of Peru sometime in the early 13th century...

 and its predecessor societies in the Andean

Andes

The Andes is the world's longest continental mountain range. It is a continual range of highlands along the western coast of South America. This range is about long, about to wide , and of an average height of about .Along its length, the Andes is split into several ranges, which are separated...

 region. A quipu usually consisted of colored, spun, and plied thread or strings from llama

Llama

The llama is a South American camelid, widely used as a meat and pack animal by Andean cultures since pre-Hispanic times....

 or alpaca

Alpaca

An alpaca is a domesticated species of South American camelid. It resembles a small llama in appearance.Alpacas are kept in herds that graze on the level heights of the Andes of southern Peru, northern Bolivia, Ecuador, and northern Chile at an altitude of to above sea level, throughout the year...

 hair. It could also be made of cotton

Cotton

Cotton is a soft, fluffy staple fiber that grows in a boll, or protective capsule, around the seeds of cotton plants of the genus Gossypium. The fiber is almost pure cellulose. The botanical purpose of cotton fiber is to aid in seed dispersal....

 cords. The cords contained numeric and other values encoded by knots in a base ten

Decimal

The decimal numeral system has ten as its base. It is the numerical base most widely used by modern civilizations....

 positional system. Quipus might have just a few or up to 2,000 cords.

Quipu is the Spanish

Spanish language

Spanish , also known as Castilian , is a Romance language in the Ibero-Romance group that evolved from several languages and dialects in central-northern Iberia around the 9th century and gradually spread with the expansion of the Kingdom of Castile into central and southern Iberia during the...

 spelling and the most common spelling in English

English language

English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

.