quipu

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun calculator consisting of a cord with attached cords; used by ancient Peruvians for calculating and keeping records

Borrowed from Spanish quipu, from Quechua khipu (“knot”).

By means of the colours and the various knots the Peruvians expressed ideas--it was their method of writing--but the quipus were chiefly used for arithmetical purposes. — The Red True Story Book, Unknown
They lacked the art of writing, although they possessed a highly developed system of mnemonic aids in the form of curiously knotted and particolored strings called quipus. — South American Fights and Fighters, and Other Tales of Adventure, Cyrus Townsend Brady

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