12th
← 11 13 → 12 | |
|---|---|
← 10 11 12 13 14 15 16 17 18 19 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 → | |
| Cardinal | twelve |
| Ordinal | 12th (twelfth) |
| Numeral system | duodecimal |
| Factorization |  |
| Divisors | 1, 2, 3, 4, 6, 12 |
| Roman numeral | XII |
| Binary | 11002 |
| Octal | 148 |
| Duodecimal | 1012 |
| Hexadecimal | C16 |
| Mathematical properties | |
| φ(12) = 4 | τ(12) = 6 |
| σ(12) = 28 | π(12) = 5 |
| μ(12) = 0 | M(12) = -2 |
 | Look up twelve in Wiktionary, the free dictionary. |
12 (twelve) is the natural number following 11 and preceding 13.
The word "twelve" is a native English word that presumably arises from the Germanic compound twa-lif "two-leave", meaning that two is left before one takes away the base, ten. This compound meaning may have been transparent to speakers of Old English, but the modern form "twelve" is quite translucent. Only the remaining tw- hints that twelve and two are related. Etymology (Weekley, Skeat) suggests that "twelve" (similar to "eleven") consists of two parts, the first meaning "two" and the second "leftover", so a literal translation would yield "two remaining ".
A group of twelve things is called a Duodecad. The ordinal adjective is duodenary, twelfth. The adjective referring to a group consisting of twelve things is duodecuple.
The number twelve is often used as a sales unit in trade, and is often referred to as a dozen. Twelve dozen are known as a gross. (Note that there are thirteen items in a baker's dozen.)
As shown below, the number twelve is frequently referenced in the Abrahamic religions and is also central to Western calendar and units of time.
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As a means of recording the passage of time, the 12th century is the period from 1101 to 1200 in accordance with the Julian calendar in the Christian / Common Era.
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Overview. The 12th century BC is the period from 1200 to 1101 BC. Although many human societies were literate in this period, most individual persons mentioned in this article ...
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