Tzotzil, a Mayan language spoken in Mexico, has a vigesimal, or base-20, counting system. 'One' is tip^na (thumb), 6 is dopa (wrist), 12 is nata (ear), 16 is tan-nata (ear on the other side), all the way to 27, or tan-h^th^ta (pinky on the other side). The words for numbers are the words for the 27 body parts they use for counting, starting at the thumb of one hand, going up to the nose, then down the other side of the body to the pinky of the other hand, as shown in the drawing. The Oksapmin people of New Guinea have a base-27 counting system. Does that blow your mind a little too much? Well there are all sorts of weird things that languages can do with number words.
But a dozenal system would require us to change our number words so that, for example, what we know as 20 would mean 24 (2x12), 30 would mean 36, and so on. 1, 2, 5 and 10), such a system would neaten up our mathematical lives in various ways. Because 12 is cleanly divisible by more factors than 10 is (1, 2, 3, 4, 6 and 12 vs. The Dozenal Society advocates for ditching the base-10 system we use for counting in favor of a base-12 system.
Today is a big day for lovers of the number 12, and no one loves 12s more than the members of the Dozenal Society.
