
1) Calculating machine 2) Calculator 3) Quechuan calculator
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https://www.crosswordclues.com/clue/quipu

Quipus (or khipus), sometimes called talking knots, were recording devices historically used in the region of Andean South America. A quipu usually consisted of colored, spun, and plied thread or strings from llama or alpaca hair. It could also be made of cotton cords. For the Inca, the system aided in collecting data and keeping records, ranging ...
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http://en.wikipedia.org/wiki/Quipu

knotted cords used as Inca mnemonic device
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http://phrontistery.info/q.html

• (n.) A contrivance employed by the ancient Peruvians, Mexicans, etc., as a substitute for writing and figures, consisting of a main cord, from which hung at certain distances smaller cords of various colors, each having a special meaning, as silver, gold, corn, soldiers. etc. Single, double, and triple knots were tied in the smaller cords, r...
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http://thinkexist.com/dictionary/meaning/quipu/

an Incan accounting apparatus consisting of a long rope from which hung 48 secondary cords and various tertiary cords attached to the secondary ones. ... [4 related articles]
Found on
http://www.britannica.com/eb/a-z/q/8

Device used by the
Incas of ancient Peru to record numerical information, consisting of a set of knotted cords of one or several colours hanging from a top-band or crossbar. It was used to take...
Found on
http://www.encyclo.co.uk/local/20688
Qui'pu noun ;
plural Quipus . [ Peruv.
quipu a knot.] A contrivance employed by the ancient Peruvians, Mexicans, etc., as a substitute for writing and figures, consisting of a main cord, from which hung at certain distances smaller cords of various colors, each having a specia...
Found on
http://www.encyclo.co.uk/webster/Q/12

[
n] - calculator consisting of a cord with attached cords
Found on
http://www.webdictionary.co.uk/definition.php?query=quipu
noun calculator consisting of a cord with attached cords; used by ancient Peruvians for calculating and keeping records
Found on
https://www.encyclo.co.uk/local/20974

a device consisting of a cord with knotted strings of various colors attached, used by the ancient Peruvians for recording events, keeping accounts, etc.
Found on
https://www.infoplease.com/dictionary/quipu

calculator consisting of a cord with attached cords
Found on
https://www.vocabulary.com/lists/454490
No exact match found.