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The knot that means one.
Also known as: Eight-shaped quipu knot
The Andean knot record's figure-of-eight knot, standing for the value one in the units position.
Stands for the value one in the units position.
Contexts: Mathematics, History
Exists because a long knot of a single turn is indistinguishable from a simple knot, so the system needed a distinct form for one — a notational patch for an ambiguity in its own design.
Contexts: Mathematics, History
A loop crossed twice into the shape of the numeral eight, tied at the lowest point on the cord.