Mayan numerals

The ancient mayan civilization used a vigesimal (base-20) numbering system. The numerals are made up of three symbols; zero (egg shape), one (a dot) and five (a bar). For example, 19 is

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Digits are stacked with the higher significant digits at the top, so

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would be read as 1-11 in base 20 or decimal 31.

see also: Arabic numerals, Chinese numerals, Roman numerals, Hebrew numerals, number system

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