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, representing definite numbers. It was chiefly used for arithmetical purposes, and to register important facts and events.

Knotted, parti-colored strings used by the ancient Peruvians to keep records. A mnemonic device.

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

An implementation of the X.500(1988) recommendations that is build on top of Isode.

A pioneering software package developed to study the OSI Directory and provide extensive pilot capabilities.