The system uses a vertical straight line as its main symbol.
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This symbol is essentially an axis that divides the two-dimensional plane into four quadrants. Each of these four quadrants signifies one of the four digits. The number can then be determined by visual inspection.
The numeral system was invented in the 1300s by French Cistercian monks. It was later replaced by the Hindu–Arabic numeral system. In any case, this numeral system later inspired several shorthands and secret ciphers. In Britain, the first person to use this cipher was John of Basingstoke.