18 (eighteen) is the natural number following 17 and preceding 19. 10 (ten) is an even natural number following 9 and preceding 11. ... Look up eight in Wiktionary, the free dictionary. ... In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 17 (seventeen) is the natural number following 16 and preceding 18. ... 19 (nineteen) is the natural number following 18 and preceding 20. ...

← 10 11 12 13 14 15 16 17 18 19 → Look up nine in Wiktionary, the free dictionary. ... 10 (ten) is an even natural number following 9 and preceding 11. ... 11 (eleven) is the natural number following 10 and preceding 12. ... Look up twelve in Wiktionary, the free dictionary. ... 13 (thirteen) is the natural number following 12 and preceding 14. ... 14 (fourteen) is the natural number following 13 and preceding 15. ... 15 (fifteen) is the natural number following 14 and preceding 16. ... 16 (sixteen) is the natural number following 15 and preceding 17. ... 17 (seventeen) is the natural number following 16 and preceding 18. ... 19 (nineteen) is the natural number following 18 and preceding 20. ... 20 (twenty) is the natural number following 19 and preceding 21. ... List of numbers — Integers This is a list of articles about numbers (not about numerals). ... The integers are commonly denoted by the above symbol. ... 0 10 20 30 40 50 60 70 80 90 → 0 (zero) is both a number and a numerical digit used to represent that number in numerals. ... 10 (ten) is an even natural number following 9 and preceding 11. ... 20 (twenty) is the natural number following 19 and preceding 21. ... 30 (thirty) is the natural number following 29 and preceding 31. ... 40 (forty) is the natural number following 39 and preceding 41. ... 50 (fifty) is the number following 49 and preceding 51. ... 60 (sixty) is the natural number following 59 and preceding 61. ... Look up seventy in Wiktionary, the free dictionary. ... 80 (eighty) is the natural number following 79 and preceding 81. ... 90 (ninety) is the natural number preceded by 89 and followed by 91. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ...
Cardinal	18 eighteen
Ordinal	18th eighteenth
Factorization
Divisors	1, 2, 3, 6, 9, 18
Roman numeral	XVIII
Roman numeral (Unicode)	XVIII, xviii
Binary	10010
Octal	22
Duodecimal	16
Hexadecimal	12

Look up eighteen in
Wiktionary, the free dictionary.

Aleph-0, the smallest infinite cardinal In mathematics, cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set. ... Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... In mathematics, factorization or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original. ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7. ... The duodecimal (also known as base-12 or dozenal) system is a numeral system using twelve as its base. ... In mathematics and computer science, hexadecimal, base-16, or simply hex, is a numeral system with a radix, or base, of 16, usually written using the symbols 0–9 and A–F, or a–f. ... Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ...

In mathematics

Eighteen is a composite number, its proper divisors being 1, 2, 3, 6 and 9. Three of these divisors (3, 6 and 9) add up to 18, hence 18 is a semiperfect number. A composite number is a positive integer which has a positive divisor other than one or itself. ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... Look up one in Wiktionary, the free dictionary. ... “II” redirects here. ... This article discusses the number three. ... Look up six in Wiktionary, the free dictionary. ... Look up nine in Wiktionary, the free dictionary. ... In mathematics, a semiperfect number or pseudoperfect number is a natural number n that is equal to the sum of all or some of its proper divisors. ...

It is a heptagonal number, and as the sum of the first three pentagonal numbers, it is a pentagonal pyramidal number. It is also the sum of the totient function for the first seven integers. A heptagonal number is a figurate number that represents a heptagon. ... A pentagonal number is a figurate number that represents a pentagon. ... A pentagonal pyramidal number is a number equal to the sum of the first few pentagonal numbers. ... In number theory, the totient φ(n) of a positive integer n is defined to be the number of positive integers less than or equal to n and coprime to n. ...

In base 10 it is a Harshad number. A Harshad number, or Niven number, is an integer that is divisible by the sum of its digits in a given number base. ...

18 is the only number that equals twice the sum of its digits.

In science

• The atomic number of argon

It has been suggested that List of elements by atomic number be merged into this article or section. ... General Name, Symbol, Number argon, Ar, 18 Chemical series noble gases Group, Period, Block 18, 3, p Appearance colorless Atomic mass 39. ...

Astronomy

• Messier object M18, a magnitude 8.0 open cluster in the constellation Sagittarius

• The New General Catalogue object NGC 18, a double star in the constellation Pegasus

• The Saros number of the solar eclipse series which began on -2416 June 2, ended on -1118 July 21, began again on -2078 April 2, and ended on -780 May 21. The duration of Saros series 18 was 1298.1 years, and it contained 73 solar eclipses.

The Messier objects are a set of astronomical objects catalogued by Charles Messier in his catalogue of Nebulae and Star Clusters first published in 1774. ... Open Cluster M18 (also known as Messier Object 18, Messier 18, M18, or NGC 6613) is an open cluster in the Sagittarius constellation. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... The Pleiades is one of the most famous open clusters. ... This article or section does not adequately cite its references or sources. ... For other uses, see Sagittarius. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... STAR is an acronym for: Organizations Society of Ticket Agents and Retailers], the self-regulatory body for the entertainment ticket industry in the UK. Society for Telescopy, Astronomy, and Radio, a non-profit New Jersey astronomy club. ... Pegasus (IPA: ) is a northern constellation, named after the mythological winged horse Pegasus. ... A Saros cycle is a period of 6585 + 1/3 days (approximately 18 years 10 days and 8 hours) which can be used to predict eclipses of the sun and the moon. ... Photo taken during the 1999 eclipse. ... June 2 is the 153rd day of the year in the Gregorian calendar (154th in leap years), with 212 days remaining. ... July 21 is the 202nd day of the year (203rd in leap years) in the Gregorian calendar. ... April 2 is the 92nd day of the year (93rd in leap years) in the Gregorian calendar, with 273 days remaining. ... May 21 is the 141st day of the year (142nd in leap years) in the Gregorian calendar. ...

In religion and literature

• The Hebrew word for "life" is חי (chai), which has a numerical value of 18. Consequently, the custom has arisen in Jewish circles to give donations and monetary gifts in multiples of 18 as an expression of blessing for long life.

• Joseph Heller's novel Catch-22 was originally named Catch-18 because of the Hebrew meaning of the number, but was amended to the published title to avoid confusion with another war novel, Mila 18.^[1]

• There are 18 chapters in the Bhagavad Gita.

“Hebrew” redirects here. ... The Hebrew Chai symbol of Judaism. ... This article does not cite any references or sources. ... Catch 22 can refer to: A book by Joseph Heller, or the movie based on the book; see Catch-22. ... Bhagavad Gīta भगवद्गीता, composed ca the fifth - second centuries BC, is part of the epic poem Mahabharata, located in the Bhisma-Parva chapters 23–40. ...

As lucky or unlucky number

• In Chinese tradition, the number 18, normally 十八 (shí bā), can also be read as 幺八 (yāo bā), which sounds like 要发 (yào fā), meaning that one is going to prosper. Thus, building floors numbered "18" are often very expensive in China^{[citation needed]}

It is also considered a number of the devil for many reasons. 6+6+6=18 666 is the number of the devil. In chapter 13 of the book of revelations it is in the verse 18 in which the book talks about the number 666. There are also 18 letters in the words six-hundred sixty six. The word tradition comes from the Latin word traditio which means to hand down or to hand over. ...

[[[[ == == == == ==

==Age 18

In many parts of the world, 18 is the age minimum for purchasing tobacco and alcoholic beverages. It is also the voting age in many countries. During the Vietnam War, Americans could be drafted at an age as low as 18, but were not allowed to vote in most states until they were 21. A movement spread to lower the voting age, and in 1971, the Twenty-sixth Amendment extended a guarantee of suffrage to anyone 18 years or older in all states. The voting age was lowered from 21 to 18 in the U.K. and many other nations around that time. This article is about the product manufactured from Tobacco plants (Nicotiana spp. ... Alcoholic beverages are drinks containing ethanol, popularly called alcohol. ... Combatants Republic of Vietnam United States Republic of Korea Thailand Australia New Zealand The Philippines National Front for the Liberation of South Vietnam Democratic Republic of Vietnam People’s Republic of China Democratic Peoples Republic of Korea Strength US 1,000,000 South Korea 300,000 Australia 48,000... 1971 (MCMLXXI) was a common year starting on Friday. ... Motto  2(French) God and my right Anthem God Save the Queen 3 United Kingdom() – on the European continent() – in the European Union() [] Location of the British overseas territories Capital London Largest conurbation (population) Greater London Urban Area Official languages English (de facto)4 Government and  -  Monarch Elizabeth II  -  Prime...

Eighteen is also the age in most countries at which a person may appear in a pornographic video, if pornography is legal at all, or express legal consent to sexual relations with another. Consent (as a term of jurisprudence) is a possible justification against civil or criminal liability. ...

An eighteen year-old is able to purchase goods from television commercials which otherwise would have been a liability issue for the seller.

In addition, eighteen year-olds in the United States have the right to bear arms, own property, marry without parental consent, get an abortion, donate their body to science, and serve on a jury. With these new privileges come responsibility: eighteen year-olds are tried as adults in court. However, there are exceptions to this tradeoff: minors can be tried as adults as early as 16 or sometimes even 7 years of age, and minors can be emancipated as early as 16 years of age, putting older minors at somewhat of a disparity of lacking the protections of children and the advantages of an adult, yet being disadvantaged by being held to the same level of responsibility or accountability as an adult.

In many countries 18 is the age of majority. This article does not adequately cite its references or sources. ...

See also: 18 certificate, Coming of age == == == == == ==]]]] The 18 certificate is issued by the British Board of Film Classification (BBFC) to state that, in its opinion, a film or video recording should not be seen or purchased by a person under 18 years old. ... It has been suggested that Coming of Age (Unitarian Universalism) be merged into this article or section. ...

In music

• String Quartets, Opus 18 by Ludwig van Beethoven is his first set of string quartets, containing six.
• 18, the title of an album by Moby
• Alice Cooper recorded the song "I'm Eighteen"
• Red Hot Chili Peppers recorded the song "She's Only 18"
• Skid Row recorded the song "18 and Life"
• Bow Wow recorded the song "Eighteen"

A portrait by Joseph Karl Stieler, 1820 Ludwig van Beethoven (IPA: ), (baptised December 17, 1770[1] – March 26, 1827) was a German composer. ... 18 is a 2002 album by artist Moby. ... Moby (born Richard Melville Hall on September 11, 1963, in Harlem, New York, and raised in Darien, Connecticut) is an American songwriter, musician and singer. ... Alice Cooper (born Vincent Damon Furnier, February 4, 1948), is a rock singer, songwriter and musician whose career spans four decades. ... It has been suggested that this article or section be merged into Love It to Death. ... Red Hot Chili Peppers (often refered to as Chili Peppers or simply RHCP) is a multiple Grammy Award-winning American rock band, formed in Los Angeles, California in 1983. ... Skid Row is an American heavy metal band which became the hair metal prototypes of the late 1980s metal scene and were reasonably successful until they were eclipsed by the Seattle grunge bands in 1991. ... Shad Gregory Moss, formerly known as Lil Bow Wow (born 9 March 1987, Columbus, Ohio) is an African African rapper, actor, and music producer. ...

In other fields

Eighteen is also:

• Bobby Labonte's car number in the NASCAR Winston Cup Series when he won the 2000 Championship. This is J. J. Yeley's car number as of 2006.
• The number of holes in a stipulated round of golf
• The number of chapters into which James Joyce's epic novel Ulysses is divided
• A slang term used in Soccer for the Penalty Area
• The number of wheels on the most common type of tractor-trailer truck, which are hence often called 18-wheelers
• The customary percentage to tip a waitress in a restaurant by groups of four or more
• The number of the French department Cher and the Turkish province Bitlis
• DVD-18 is double-sided, double-layered DVD format
• A Canon error message, see E18 error
• In neo-Nazi circles, a code word for Adolf Hitler. The number comes from the position of the letters in the alphabet: A = 1, H = 8. See also 88
• Dragon Ball Z Character, Android 18.
• Jersey number of football players Peyton Manning and Randy Moss.
• Jersey number of former basketball player Phil Jackson
• Uniform number of former baseball player Don Larsen. The number shows prominently in a photograph taken just before the last pitch he made in his perfect game in the 1956 World Series. (When this picture was printed in Baseball's Unforgettable Games by Joseph Reichler and Ben Olan in 1960, they gave it the caption "The Writing on the Wall.")
• The Hindu epic Mahabharata has eighteen sections, involves eighteen armies and is about a war fought over eighteen days
• The sacred literature of the Hindus known as Bhagavad Gita has eighteen chapters.
• In some countries the number 18 means blood (relative)

Bobby Labonte Bobby Labontes former JGR car on display at the Joe Gibbs Racing headquarters. ... The NASCAR NEXTEL Cup Series is NASCARs top racing series. ... The 2000 NASCAR Winston Cup Season began on Sunday February 13 and ended on Sunday November 20. ... Christopher Beltram Hernandez (J. J.) Yeley (born October 5, 1976) is an NASCAR racecar driver from Phoenix, Arizona. ... The 2006 NASCAR NEXTEL Cup season started at Daytona International Speedway on Sunday, February 12 with the Bud Shootout and will end on Sunday, November 19 with the Ford 400 at Homestead-Miami Speedway. ... Golf is a sport in which individual players or teams hit a ball into a hole using various clubs, and also is one of the few ball games that does not use a fixed standard playing area. ... James Augustine Aloysius Joyce (Irish Séamus Seoighe; 2 February 1882 – 13 January 1941) was an Irish writer, widely considered to be one of the most influential writers of the 20th century. ... Ulysses is a novel by James Joyce, first serialized in parts in the American journal The Little Review from March 1918 to December 1920, and then published in its entirety by Sylvia Beach on February 2, 1922, in Paris. ... Football is a ball game played between two teams of eleven players, each attempting to win by scoring more goals than their opponent. ... The penalty area (colloquiallly also known as the 18-yard box, penalty box or simply the box), is an area of an association football field. ... semi-trailer truck with sleeper behind the cab. ... The départements (or departments) are administrative units of France, roughly analogous to British counties and are now grouped into 22 metropolitan and four overseas régions. ... Cher is a département in the center of France. ... Provinces of Turkey are called iller in Turkish (singular is il, see Turkish alphabet for capitalization of i). ... Bitlis is a city in Turkey, capital of Bitlis Province. ... DVD (also known as Digital Versatile Disc or Digital Video Disc) is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ... In digital photography, the E18 error is an error message on Canon digital cameras. ... The terms Neo-Nazism and Neo-Fascism refer to any social or political movement to revive Nazism or Fascism, respectively, and postdates the Second World War. ... A Code word may refer any of several concepts: For telecommunications senses, see Code word (telecommunication). ... Hitler redirects here. ... This article or section needs additional references or sources to improve its verifiability. ... Look up one in Wiktionary, the free dictionary. ... Look up H, h in Wiktionary, the free dictionary. ... Look up eight in Wiktionary, the free dictionary. ... 88 (eighty-eight) is the natural number following 87 and preceding 89. ... Android-18 (Jinzō-ningen-jÅ«hachi-gō Artificial Human Number-18, or simply JÅ«hachi-gō Number-18; also known as Cyborg-18 or C-18 in the Spanish dub to everyone after the Cell Games Saga. ... Peyton Williams Manning (born March 24, 1976 in New Orleans, Louisiana)[1] is an American football quarterback for the Indianapolis Colts NFL franchise. ... Randy Gene Moss (born February 13, 1977 in Rand, West Virginia) is an American football wide receiver for the New England Patriots. ... Philip Douglas Phil Jackson (born September 17, 1945 in Deer Lodge, Montana) is the current coach of the Los Angeles Lakers, an American professional basketball team. ... Donald James Larsen (born August 7, 1929 in Michigan City, Indiana) was a Major League Baseball pitcher for 14 seasons. ... Pitcher David Cone (left) of the New York Yankees reacting to the completion of his perfect game with catcher Joe Girardi on July 18, 1999. ... The 1956 World Series of Major League Baseball was played between the New York Yankees (representing the American League) and the defending champion Brooklyn Dodgers (representing the National League) during the month of October 1956. ... For the film by Peter Brook, see The Mahabharata (1989 film). ... Bhagavad Gīta भगवद्गीता, composed ca the fifth - second centuries BC, is part of the epic poem Mahabharata, located in the Bhisma-Parva chapters 23–40. ...

Historical years

A.D. 18, 18 B.C., 1918, 2018, etc. Ë‘ This article is about the year 18. ... Centuries: 2nd century BC - 1st century BC - 1st century Decades: 60s BC 50s BC 40s BC 30s BC 20s BC - 10s BC - 0s 10s 20s 30s 40s Years: 23 BC 22 BC 21 BC 20 BC 19 BC 18 BC 17 BC 16 BC 15 BC 14 BC 13 BC... 1918 (MCMXVIII) was a common year starting on Tuesday of the Gregorian calendar (see link for calendar) or a common year starting on Wednesday of the Julian calendar. ... 2018 (MMXVIII) will be a common year starting on Monday of the Gregorian calendar. ...

See also

• Numeral system

A numeral is a symbol or group of symbols, or a word in a natural language that represents a number. ...

Notes

1. ^ N James. The Early Composition History of Catch-22. In Biographies of Books: The Compositional Histories of Notable American Writings, J Barbour, T Quirk (edi.) pp. 262-90. Columbia: University of Missouri Press, 1996