Twelve

Twelve is a natural number following eleven and preceding thirteen. The number twelve holds significance in various fields such as mathematics, religion, and culture.

Mathematics[edit | edit source]

In mathematics, twelve is a superior highly composite number, a number with more divisors than any number scaled down from it. It is approximately the integer part of the 12th root of 2. It is a Harshad number and a subfactorial number.

In religion, the number twelve holds a significant place. In Christianity, there are twelve apostles of Jesus. In Judaism, there are twelve tribes of Israel. In Islam, there are twelve Imams in Shia Islam.

In culture, there are twelve months in a year in the Gregorian calendar. There are also twelve signs in the Zodiac. In music, there are twelve notes in the chromatic scale.

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v t e Number systems
Sets of definable numbers	Natural numbers (<math>\mathbb N</math>) Integers (<math>\mathbb Z</math>) Rational numbers (<math>\mathbb Q</math>) Constructible numbers Algebraic numbers (<math>\mathbb A</math>) Closed-form numbers Periods Computable numbers Arithmetical numbers Set-theoretically definable numbers Gaussian integers
Composition algebras	Division algebras: Real numbers (<math>\Reals</math>) Complex numbers (<math>\Complex</math>) Quaternions (<math>\mathbb H</math>) Octonions (<math>\mathbb O</math>)
Split types	Over <math>\Reals</math>: Split-complex numbers Split-quaternions Split-octonions Over <math>\Complex</math>: Bicomplex numbers Biquaternions Bioctonions
Other hypercomplex	Dual numbers Dual quaternions Dual-complex numbers Hyperbolic quaternions Sedenions (<math>\mathbb S</math>) Split-biquaternions Multicomplex numbers Geometric algebra/Clifford algebra Algebra of physical space Spacetime algebra Plane-based geometric algebra
Other types	Cardinal numbers Extended natural numbers Irrational numbers Fuzzy numbers Hyperreal numbers Levi-Civita field Surreal numbers Transcendental numbers Ordinal numbers p-adic numbers (p-adic solenoids) Supernatural numbers Profinite integers Superreal numbers Normal numbers
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