In mathematics
Eighteen occurs as composite number, its proper divisors being 1, 2, 3, 6 and 9. These are the heptagonal number, and when a total of the foremost 3 pentagonal numbers, it is the pentagonal pyramidal number. These are the Harshad number.

In science
The atomic number of argon

Within astronomy,

In human affairs: Age 18
Within numbers of arethe of the globe, Xviii is the age minimal for existence allowed a driver's license and/or for purchasing alcohol or tobacco. These are too a balloting age within numbers of countries. When you took a Vietnam War, Americans could be drafted at an age when online at Xviii, however were non allowed to vote inside virtually all states until it were Twenty-one. a movement spread to lower the ballot age, & within 1971, the Twenty-26th Amendment extended the assure of vote to anyone Eighteen years or even older altogether states. A vote age was lowered from either 21 to 18 in the U.K. and many other nations around that time.

Eighteen is as well a age withwitharound virtually all countries at which the human can come out in the pornographic cd, whenever eroticthe is legal in the least, or even even even get laid by owning the human in a position of authority on top the children (a teacher, athletic coach, or employer, e.g., or in the main anyone else across the age of Eighteen).

Watch likewise: 18 certificate

In Judaism
Around Hebrew Numerology, a word for life (Inside Hebrew language "Chai" - חי), adds up to Xviii. Following, a total Xviii is believed to become lucky, & donations & pecuniary gifts come typically given around multiples of Xviii.

In other fields
Eighteen is besides utilized within neo-Nazi circles as a code word for Adolf Hitler. The total comes from either a position of the letters in the alphabet: A = 1, H = 8. Look at as well 88.

Eighteen is likewise: 18, the title of an album by Moby. the total of holes around a game of golf. The slang utilized inside Soccer for the Penalty Area. A total of wheels on the usual nature and severity of tractor-trailer truck, which are hence typically known as 18-wheelers. Any of various historical years: 18 A.D., 18 B.C., or 1918. the customary percentage to tip the waitress within a eating place by groups of quaternity or even more A total of the French department Cher and the Turkish province Bitlis DVD-18 is double-sided, double-layered DVD format

ca:Divuit de:Achtzehn es:Dieciocho eo:Dek ok fr:18 (nombre) ko:18 it:Diciotto he:18 (מספר) nah:Caxtollin-yei nl:Achttien ja:18 nb:18 (tall) pt:Dezoito ru:18 (чиÑ?ло) sl:18 (Å¡tevilo) sv:18 (tal)