What does 12 mean?

12 (12) is a two-digit natural number between 1 1 and 13, which is even. In daily arithmetic units, 12 is also called a dozen.

Writing method

Twelve Chinese characters

Twelve Chinese characters (capital)

Arabic

? Armenian

ιβ? Greece (Ionian)

ΔΙΙ? Greece (Attica)

Hebrew (language)

? India (Natural Language)

вi Cyrillic alphabet

tamil

Roman numerals and Etruscan

Thai

IIX chuvash language

Twelve English

history

The 6th century mural "Twelve Bronze Tables" by Beit Alpha in Israel is the first written code in Roman history.

Shoto Kutaishi, a Japanese, has won the 12th prize.

19911February 9-10, 12 Former European member states signed the Treaty on the European Union.

Chinese Ancient History

In ancient China, girls aged 12 were called "the year of golden hairpin".

There are twelve scorpions on the crown of the Zhou emperor, that is, jade ropes hanging from his hat. The number of scorpions will decrease with the rank of the prince.

Twelve chapters of clothing decoration pictures are recorded in Shangshu Yiji, which shows the 12 pattern decorated on the emperor's coronation clothes. They are the sun, moon, stars, mountains, dragons and China worms on the clothes, as well as seaweed, Zong Yi, fire, pink rice, horseshoe crab (sound pot) and cricket (sound Buddha) embroidered on the clothes.

Before 22 1, Qin Shihuang, the ruler of the Qin Dynasty, ordered the collection of weapons from various countries, and after destruction, they were cast into "Twelve Golden Men (or Twelve Bronze Men)"

According to the Records of History of Song Dynasty (Volume 365) and Biography of Yue Fei, the Song Dynasty awarded twelve gold medals in one day and recalled Yue Fei who fought against Jin to Beijing.

technology

There are 12 function keys (F 1, F2, F3, F4, F5, F6, F7, F8, F9, F 10, F 1 2) on the computer keyboard.

A standard digital telephone has 12 dialing keys (1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, #).

The ASCII code and Unicode code of the computer page-changing key are 12.

The most common voltage on cars, batteries and many weak current devices is 12 volts.

In the early Warring States period, the large-scale water diversion irrigation system in China with Zhangshui as its source was Zhangyin No.12 Canal.

literature and art

Music and drama 12 semitone on the piano keyboard

The Twelve Laws (Zodiac), according to legend, is Ling Lun, a musician of the Yellow Emperor. Based on the principle that the length of bamboo tubes causes different pronunciations, the rules of temperament are set.

The law of twelve averages invented by Zhu Zaiyu in Ming Dynasty.

The octave consists of 12 semitones.

Twelve-tone technique or twelve-tone system is a kind of scale.

Twelve-tone music, one of the schools of modern music.

Muqam * * is a traditional classical divertimento which is popular in Xinjiang Uygur area of China and integrates singing, dancing and music. There are 12 sets at present.

In the mid-Qing Dynasty, the "Jianghu Twelve Feet Color" in the commercial system of Kunshan accent and foot color.

Weights and Measures In daily life, 12 is a common unit for counting or commodity packaging, called a dozen. Eggs, refills, egg tarts, etc. They are often bought by the dozen. According to Modern Chinese Dictionary, 12 is called Luo Yi, but this title is rare.

In the prefix of the international system of units, 10 12 is called Thailand according to the legal unit of measurement in People's Republic of China (PRC). According to the name, definition and code of the legal unit of measurement and its multiples and scores published by the Ministry of Economic Affairs of the Republic of China, it is called Zhao (English code T). 10- 12 is called Pi (English code p).

In English units, the length of 1 foot is equal to 12 inch.

In the unit of weight used in China from the Warring States Period to the Sui Dynasty, twelve baht is equal to half two.

In the gold balance system for trading precious metals (and the drug balance system for weighing drugs), 65,438+02 troy ounces (drug balance ounces) is equal to 65,438+0 troy pounds (drug balance pounds) (this is different from 65,438+0 pounds in general English units (constant scales)).

Before the monetary system reform of Britain 197 1, 1 shilling was equal to12p.

The highest Beaufort scale for measuring wind force is 12, which is called hurricane.

The intensity of the earthquake in mcquarrie, which measures the degree of damage to the ground caused by the earthquake, is 12 degrees at the highest.

Mathematical attribute

algebra

The factors of the sixth composite number are: 1, 2, 3, 4, 6, 12.

Fifth highest composite number

Pell number

The first residue

The sum of the Pythagorean numbers of the first group (the circumference of the Egyptian triangle: 3:4:5)

The third pentagonal number and tangible number

The fourth Pronik number

The smallest number n is equal to n and n! Can be expressed as the product of multiple prime factorials (12 = 2! 3! ; 12! = 2! 3! 1 1! )

A unique number makes n 1, n/2 1 and n/3 1 all prime numbers.

The third super factorial is the product of the first three factorials.

The cardinal number of decimal notation. Decimalization is considered to be a relatively simple way to express shares with decimals, but it is not used in daily life calculation.

In the notation based on 13 or above (such as hexadecimal, etc. ), 12 is marked with the Latin letter C.

The factor of the sum of any pair of twin prime numbers (except the first pair).

The number of positive factors of 12 (6) is a perfect number, and the sum of all its positive factors is also a perfect number (1+2+3+4+6+ 12=28). Only two figures of this nature have been found for the time being.

Source: (/s/blog _ 490AFBB60100C8U5.html)-/meaning of kloc-0/2 _ Rolling up a thousand snows _ Sina blog

geometry

A regular dodecahedron composed of regular pentagons.

A polygon with 12 sides is called a dodecagon.

A polyhedron with 12 faces is called a dodecahedron, in which a regular dodecahedron is one of the five regular polyhedrons.

12 is the number of kisses in three-dimensional space.

In the problem of ball installation in three-dimensional Euclidean space, if the unit ball is tangent to the unit ball, 12 balls can be put in (Kepler conjecture).

In polyhedron, 12 is the number of edges of cubes and octahedrons, and also the number of vertices of icosahedron, truncated semi-cube and truncated tetrahedron.

natural science

The position of magnesium in the periodic table of elements is 12.

The atomic number of magnesium is 12.

Chemistry has dodecanedioic acid (DDAD).

The unit mole used to calculate the amount of a substance is defined as the number of atoms contained in 12g carbon12.

Lepton * * has 12 species, including antiparticles.

There are also 12 quarks including antiparticles.

There are 12 kinds of bosons, including photons, 3 kinds of weakly interacting medium particles and 8 kinds of gluons.

Messier objects M 12 in Ophiuchus is a globular cluster of magnitude 8.0.

The NGC object NGC 12 located in Pisces is a spiral nebula with a magnitude of 13 438+0.

Time and calendar

12 hour wall clock

The period of the earth's revolution around the sun is about 12 times that of the moon's revolution around the earth, so the number 12 is of special significance to human timing and calendar.

In order to mark the position of the sun on the ecliptic every month, the Babylonians divided the sky that the sun passes through every month into 12 constellations, that is, the zodiac, and the 12 constellation of the zodiac (that is, the 12 constellation) is Pisces. In ancient China, the Chinese zodiac on Sunday was divided into twelve days and twelve times.

In ancient China, there was a branch of 12 to record the time and sequence, and the sea platoon was 12. 10 trunk and 12 underground branch are recycled, which is a calendar year method in ancient China, with 60 years as a cycle. Each earthly branch is matched with 12 animals to become the zodiac, and 12 animals are pigs. 1 year is divided into 24 solar terms with 12 earthly branches. The time of day is also represented by local branches, so there are 12 hours in a day, starting from midnight, which is equivalent to 23:00 the day before and 0 1:00 the day before.

The modern international calendar divides 1 year into 12 months. 12 months vary in length, but they all have 12 days. They are 65438+1October 12, February 12, March 12, April 12, May 12 and June 12.

1 day is divided into 24 hours, with 12 hours in the morning and afternoon respectively. In a day, the hour hand of a clock will turn on the dial twice, divided by 12 hour. The minute hand length is slightly equal to 1.5 times of the hour hand, and the running speed is 12 times of the hour hand.

In addition, in terms of calendar years, there are 12 BC, 12 AD, 12 BC and 12 AD recorded by human beings.

Religion and myth

Leonardo da Vinci's The Last Supper

In Greek mythology,

The twelve gods who entered the Pantheon were called "Twelve Olympians". As the twelve gods in different periods contain different gods, there are actually 14 gods who enjoy this honor.

Legend has it that Titan once ruled the world has 12. They are children of Uranus and Gaia, the goddess of the earth.

Hercules, one of the greatest heroes in Greek mythology, made 12 Xiang Ying.

According to the British legend about King Arthur, he owned 12 knights of the Round Table.

In Christianity,

The 12 disciples of Jesus are called the twelve disciples of Jesus.

According to Genesis 49.28, Jacob's 12 sons founded Israel.

Traditionally, 12 night after Christmas is the eve of Epiphany (also known as the twelfth night), that is, 65438+1October 5 in the Gregorian calendar; 65438+10.6 is called the appearance day (also called the first 12 day).

The 12 National Day is a very important Christian festival in the Orthodox Church.

In the traditional Jewish custom, a girl should hold a bar mitzvah when she is 12 years old.

In Buddhism,

The explanation of reincarnation is called the theory of twelve causes.

Twelve places are common names in Buddhism.

There are also some names of 12 gods in Buddhism. For example, the pharmacist Buddha has twelve dharma gods, and there is also a 12 dharma god called twelve days.

Twelve doctrines are Buddhist classics, which explain Mahayana's concept of emptiness in twelve ways.

Buddhism divides Sanzang into twelve categories according to genre and content, which are called Twelve Schools or Twelve Classics.

A branch of Shia Islam is called the Twelve Imams.

Three-hole and Twelve-part Classification, Four Auxiliary Classes in Taoist Classics Classification

In Manichaeism, there are twelve names of King Bao Guang who live there forever.

Medical treatment and sanitation

Most people have 12 pairs of ribs.

Physiologically, most people have 12 pairs of ribs. The initial part of the small intestine starting from the pylorus of the stomach is called the duodenum. The related diseases are duodenitis and duodenal ulcer, and the parasite is duodenal worm. This operation is called duodenectomy.

According to the meridian theory of traditional Chinese medicine, the human body has twelve meridians. The twelve meridians, which originates from elbow and knee of limbs and follows the branches of chest, abdomen and head, is called the twelve meridians; The area of the whole body muscle divided by the twelve meridians circulation distribution is called the twelve meridians; The twelve meridians's important acupoints near the wrist and ankle joints are called Twelve Original Acupoints. According to the the twelve meridians circulation distribution, the skin area on the body surface is called twelve skins; The specific point where the qi of zang-fu organs gathers in the chest and abdomen is called Moxue point, with 12.

Vitamin B 12 is an essential vitamin for human body, which is mainly absorbed by animals. Lack of it will lead to anemia.

Other fields

EU flag

L (lowercase "l") is the 12 letter of the Latin alphabet.

Lamed is the letter 12 in the Hebrew alphabet.

The EU flag consists of 12 Venus arranged in a circle, representing 12 countries that founded the EU.

In a football match, the penalty is 0/2 yards away from the goal/kloc-.

According to international law, the territorial sea of each country is 12 nautical mile outside the land.

Is the twelfth of the sixty-four hexagrams in Zhouyi a hexagram?

There are 12 jurors in Britain and America.

A calendar in the yellow calendar is called twelve values.

China's Traditional Self-massage Method-Twelve Brocades

K- 12 is the abbreviation of school grades in the United States and Canada.

Twelve peaks in Wushan are located in the Three Gorges of the Yangtze River.

12 years old is the age limit for children and adolescents.

The number "12" in the Book of Changes

1 .12 Yao taiji diagram

2. Dry hanging six hexagrams and Kun hexagrams, which is "12".

3. Gossip * * * is positive for 12 and negative for 12.

People have 12 pairs of cranial nerves.

5. People have 12 thoracic vertebrae.

6. People have 12 pairs of thoracic nerves.

7. People have 12 organs,

8. People have 12 upper limbs.

9. People have 12 lower limbs.

10. Whole body 12 general resuscitation (left eye, right eye, left ear, right nostril, right nostril, mouth, left nipple, right nipple, navel, front vagina and back vagina)

1 1. The Great Hall of the People has 12 stone pillars, and the 2005 version of RMB has 12 anti-counterfeiting touch lines.

12. The English number 1- 12 is an independent syllable. After 12- 19, add the suffix "teen".

The mysterious origin of the number "12" is decrypted by using the method of 12 taiji diagram to spread gossip.