Dozenal (also known as duodecimal) is a positional notation numeral system that uses twelve digits instead of ten: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, X (ten), E (eleven). Dozenal arithmetic is more organic and simpler than decimal arithmetic. It all comes down to the fact that twelve can be divided into 2, 3, 4 and 6, whereas ten can only be divided into 2 and 5. 20% of the profits are donated to the Dozenal Society of America (DSA).
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