Uncommon
Duodecimal
Base-12 numeral system
Duodecimal
A duodecimal system, also known as base twelve or dozenal (from dozen), is a positional numeral system using twelve as its base. In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten. In duodecimal, "100" means twelve squared (144), "1,000" means twelve cubed (1,728), and "0.1" means one twelfth (0.08333...). Various symbols have been used to stand for ten and eleven in duodecimal notation; this page uses A and B, as in hexadecimal, which make a duodecimal count from zero to twelve read: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, 10. The Dozenal Societies of America and Great Britain (organisations promoting the use of duodecimal) use turned digits in their published material: 2 or ↊ (a turned 2) for ten (dek, pronounced /dɛk/) and 3 or ↋ (a turned 3) for eleven (el, pronounced /ɛl/). Following those numbers is twelve (do, pronounced /doʊ/). The number...
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