Thehe Aztec numerical system was [[vigesimal]]. They indicated quantities up to twenty by the requisite number of dots. A flag was used to indicate twenty, repeating it for quantities up to four hundred, while a sign like a fir tree, meaning numerous as hairs, signified four hundred. The next unit, eight thousand, was indicated by an incense bag, which referred to the almost innumerable contents of a sack of cacao beans.<ref>{{cite book |author=Vaillant, George C. |year=1941 |title=Aztecs of Mexico |pages=206–209}}</ref>
