11 (eleven) is the
natural number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country").
Numbers used for counting are called '' cardinal ...
following
10 and preceding
12. It is the first
repdigit
In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal). The word is a portmanteau of repeated and digit.
Example ...
. In English, it is the smallest positive integer whose name has three syllables.
Name
"Eleven" derives from the
Old English
Old English (, ), or Anglo-Saxon, is the earliest recorded form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages. It was brought to Great Britain by Anglo-Saxon settlers in the mid-5th ...
', which is first attested in
Bede
Bede ( ; ang, BÇ£da , ; 672/326 May 735), also known as Saint Bede, The Venerable Bede, and Bede the Venerable ( la, Beda Venerabilis), was an English monk at the monastery of St Peter and its companion monastery of St Paul in the Kingdom o ...
's late 9th-century ''
Ecclesiastical History of the English People
The ''Ecclesiastical History of the English People'' ( la, Historia ecclesiastica gentis Anglorum), written by Bede in about AD 731, is a history of the Christian Churches in England, and of England generally; its main focus is on the conflict be ...
''.
[ It has cognates in every ]Germanic language
The Germanic languages are a branch of the Indo-European language family spoken natively by a population of about 515 million people mainly in Europe, North America, Oceania and Southern Africa. The most widely spoken Germanic language, Engli ...
(for example, German ), whose Proto-Germanic
Proto-Germanic (abbreviated PGmc; also called Common Germanic) is the reconstructed proto-language of the Germanic branch of the Indo-European languages.
Proto-Germanic eventually developed from pre-Proto-Germanic into three Germanic branc ...
ancestor has been reconstructed as , from the prefix (adjectival " one") and suffix , of uncertain meaning.[ It is sometimes compared with the Lithuanian ', though ' is used as the suffix for all numbers from 11 to 19 (analogously to "-teen").][
The ]Old English
Old English (, ), or Anglo-Saxon, is the earliest recorded form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages. It was brought to Great Britain by Anglo-Saxon settlers in the mid-5th ...
form has closer cognates in Old Frisian
Old Frisian was a West Germanic language spoken between the 8th and 16th centuries along the North Sea coast, roughly between the mouths of the Rhine and Weser rivers. The Frisian settlers on the coast of South Jutland (today's Northern Friesl ...
, Saxon
The Saxons ( la, Saxones, german: Sachsen, ang, Seaxan, osx, Sahson, nds, Sassen, nl, Saksen) were a group of Germanic
*
*
*
*
peoples whose name was given in the early Middle Ages to a large country (Old Saxony, la, Saxonia) near the Nor ...
, and Norse, whose ancestor has been reconstructed as . This was formerly thought to be derived from Proto-Germanic (" ten");[ it is now sometimes connected with or ("left; remaining"), with the implicit meaning that "one is left" after counting to ten.][''Oxford English Dictionary'', 1st ed. "eleven, ''adj.'' and ''n.''" Oxford University Press (Oxford), 1891.]
In English, "eleven" is the only two-digit number that does not contain the letter T.
In languages
While 11 has its own name in Germanic languages such as English, German, or Swedish, and some Latin-based languages such as Spanish, Portuguese, and French, it is the first compound number in many other languages: Italian , Chinese , Korean or .
In mathematics
11 is the fifth prime number
A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...
, and the first two-digit numeric palindrome. The next prime number is 13, with which it comprises a twin prime
A twin prime is a prime number that is either 2 less or 2 more than another prime number—for example, either member of the twin prime pair (41, 43). In other words, a twin prime is a prime that has a prime gap of two. Sometimes the term ''twin pr ...
. 11 is the first repunit prime
In recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1 — a more specific type of repdigit. The term stands for repeated unit and was coined in 1966 by Albert H. Beiler in his book ''Recreat ...
, the first strong prime
In mathematics, a strong prime is a prime number with certain special properties. The definitions of strong primes are different in cryptography and number theory.
Definition in number theory
In number theory, a strong prime is a prime number t ...
, the second unique prime
The reciprocals of prime numbers have been of interest to mathematicians for various reasons. They do not have a finite sum, as Leonhard Euler proved in 1737.
Like all rational numbers, the reciprocals of primes have repeating decimal represen ...
, the second good prime A good prime is a prime number whose square is greater than the product of any two primes at the same number of positions before and after it in the sequence of primes.
That is, good prime satisfies the inequality
:p_n^2 > p_ \cdot p_
for all 1 â ...
, the third super-prime
Super-prime numbers, also known as higher-order primes or prime-indexed primes (PIPs), are the subsequence of prime numbers that occupy prime-numbered positions within the sequence of all prime numbers.
The subsequence begins
:3, 5, 11, 17, 31, ...
, and the fourth Lucas prime
The Lucas numbers or Lucas series are an integer sequence named after the mathematician Édouard Lucas, François Édouard Anatole Lucas (1842–1891), who studied both that sequence and the closely related Fibonacci numbers. Lucas numbers a ...
.
11 is the first prime number that is not an exponent for a Mersenne prime
In mathematics, a Mersenne prime is a prime number that is one less than a power of two. That is, it is a prime number of the form for some integer . They are named after Marin Mersenne, a French Minim friar, who studied them in the early 17t ...
, as 211 − 1 = 2047, which is composite
Composite or compositing may refer to:
Materials
* Composite material, a material that is made from several different substances
** Metal matrix composite, composed of metal and other parts
** Cermet, a composite of ceramic and metallic materials
...
.
11 is a Heegner number In number theory, a Heegner number (as termed by Conway and Guy) is a square-free positive integer ''d'' such that the imaginary quadratic field \Q\left sqrt\right/math> has class number 1. Equivalently, its ring of integers has unique factoriza ...
, meaning that the ring of integers
In mathematics, the ring of integers of an algebraic number field K is the ring of all algebraic integers contained in K. An algebraic integer is a root of a monic polynomial with integer coefficients: x^n+c_x^+\cdots+c_0. This ring is often deno ...
of the field
Field may refer to:
Expanses of open ground
* Field (agriculture), an area of land used for agricultural purposes
* Airfield, an aerodrome that lacks the infrastructure of an airport
* Battlefield
* Lawn, an area of mowed grass
* Meadow, a grass ...
has the property of unique factorization
In mathematics, a unique factorization domain (UFD) (also sometimes called a factorial ring following the terminology of Bourbaki) is a ring in which a statement analogous to the fundamental theorem of arithmetic holds. Specifically, a UFD is a ...
. As a consequence, there exists at most one point on the elliptic curve ''x''3 = ''y''2 + 11 that has positive-integer coordinates. In this case, this unique point is ( 15, 58).
There are 11 orthogonal curvilinear coordinate systems
In geometry, a coordinate system is a system that uses one or more numbers, or coordinates, to uniquely determine the position of the points or other geometric elements on a manifold such as Euclidean space. The order of the coordinates is sign ...
(to within a conformal symmetry) in which the 3-variable Helmholtz equation
In mathematics, the eigenvalue problem for the Laplace operator is known as the Helmholtz equation. It corresponds to the linear partial differential equation
\nabla^2 f = -k^2 f,
where is the Laplace operator (or "Laplacian"), is the eigenv ...
can be solved using the separation of variables
In mathematics, separation of variables (also known as the Fourier method) is any of several methods for solving ordinary and partial differential equations, in which algebra allows one to rewrite an equation so that each of two variables occurs ...
technique.
The rows of Pascal's Triangle
In mathematics, Pascal's triangle is a triangular array of the binomial coefficients that arises in probability theory, combinatorics, and algebra. In much of the Western world, it is named after the French mathematician Blaise Pascal, although ot ...
can be seen as representation of the powers of 11.
11 of 35 hexominoes can fold in a net
Net or net may refer to:
Mathematics and physics
* Net (mathematics), a filter-like topological generalization of a sequence
* Net, a linear system of divisors of dimension 2
* Net (polyhedron), an arrangement of polygons that can be folded up ...
to form a cube
In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex. Viewed from a corner it is a hexagon and its net is usually depicted as a cross.
The cube is the only r ...
, while 11 of 66 octiamonds can fold into a regular octahedron
In geometry, an octahedron (plural: octahedra, octahedrons) is a polyhedron with eight faces. The term is most commonly used to refer to the regular octahedron, a Platonic solid composed of eight equilateral triangles, four of which meet at ea ...
.
An 11-sided polygon
In geometry, a polygon () is a plane figure that is described by a finite number of straight line segments connected to form a closed ''polygonal chain'' (or ''polygonal circuit''). The bounded plane region, the bounding circuit, or the two toge ...
is called a hendecagon or undecagon. The complete graph
In the mathematical field of graph theory, a complete graph is a simple undirected graph in which every pair of distinct vertices is connected by a unique edge. A complete digraph is a directed graph in which every pair of distinct vertices is c ...
''K''11 has a total of 55 edges, which collectively represent the diagonal
In geometry, a diagonal is a line segment joining two vertices of a polygon or polyhedron, when those vertices are not on the same edge. Informally, any sloping line is called diagonal. The word ''diagonal'' derives from the ancient Greek δ ...
s and sides of a hendecagon.
The number 11 appears in tessellations
A tessellation or tiling is the covering of a surface, often a plane (mathematics), plane, using one or more geometric shapes, called ''tiles'', with no overlaps and no gaps. In mathematics, tessellation can be generalized to high-dimensional ...
in various dimension
In physics and mathematics, the dimension of a Space (mathematics), mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any Point (geometry), point within it. Thus, a Line (geometry), lin ...
s and geometrical spaces; there are:
* 11 regular complex apeirogons, which are tilings with polygons that have a countably infinite
In mathematics, a set is countable if either it is finite or it can be made in one to one correspondence with the set of natural numbers. Equivalently, a set is ''countable'' if there exists an injective function from it into the natural numbers; ...
number of sides. 8 solutions satisfy δ in where ''q'' is constrained to , while 3 contain affine nodes and include infinite solutions, two in , and one in .
* 11 regular and semiregular convex uniform tilings in two-dimensional Euclidean space
In mathematics, the Euclidean plane is a Euclidean space of dimension two. That is, a geometric setting in which two real quantities are required to determine the position of each point ( element of the plane), which includes affine notions of ...
, which are dual to the 11 Laves tiling
This table shows the 11 convex uniform tilings (regular and semiregular) of the Euclidean plane, and their dual tilings.
There are three regular and eight semiregular tilings in the plane. The semiregular tilings form new tilings from their dua ...
s.
* 11 paracompact regular hyperbolic honeycombs with infinite facets
A facet is a flat surface of a geometric shape, e.g., of a cut gemstone.
Facet may also refer to:
Arts, entertainment, and media
* ''Facets'' (album), an album by Jim Croce
* ''Facets'', a 1980 album by jazz pianist Monty Alexander and his tri ...
and vertex figures
In geometry, a vertex figure, broadly speaking, is the figure exposed when a corner of a polyhedron or polytope is sliced off.
Definitions
Take some corner or vertex of a polyhedron. Mark a point somewhere along each connected edge. Draw lines ...
in the third dimension (alongside 4 compact hyperbolic honeycombs).
* 11 regular hyperbolic honeycombs in the fourth dimension: 9 compact solutions are generated from regular 4-polytopes and regular star 4-polytopes, alongside 2 paracompact solutions.
The 11-cell
In mathematics, the 11-cell (or hendecachoron) is a self-dual abstract regular 4-polytope ( four-dimensional polytope). Its 11 cells are hemi-icosahedral. It has 11 vertices, 55 edges and 55 faces. It has Schläfli symbol , with 3 hemi-icosahedr ...
is a self-dual abstract 4-polytope with 11 vertices, 55 edges, 55 triangular
A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices ''A'', ''B'', and ''C'' is denoted \triangle ABC.
In Euclidean geometry, any three points, when non- collinea ...
faces
The face is the front of an animal's head that features the eyes, nose and mouth, and through which animals express many of their emotions. The face is crucial for human identity, and damage such as scarring or developmental deformities may affe ...
, and 11 hemi-icosahedral cells
Cell most often refers to:
* Cell (biology), the functional basic unit of life
Cell may also refer to:
Locations
* Monastic cell, a small room, hut, or cave in which a religious recluse lives, alternatively the small precursor of a monastery w ...
. It is ''universal'' in the sense that it is the only abstract polytope with hemi-icosahedral facets and hemi-dodecahedral vertex figure
In geometry, a vertex figure, broadly speaking, is the figure exposed when a corner of a polyhedron or polytope is sliced off.
Definitions
Take some corner or Vertex (geometry), vertex of a polyhedron. Mark a point somewhere along each connect ...
s. The 11-cell contains the same number of vertices and edges as the complete graph
In the mathematical field of graph theory, a complete graph is a simple undirected graph in which every pair of distinct vertices is connected by a unique edge. A complete digraph is a directed graph in which every pair of distinct vertices is c ...
''K''11 and the 10-simplex, a regular polytope
In mathematics, a regular polytope is a polytope whose symmetry group acts transitively on its flags, thus giving it the highest degree of symmetry. All its elements or -faces (for all , where is the dimension of the polytope) — cells, f ...
in 10 dimensions.
Mathieu group
In group theory, a topic in abstract algebra, the Mathieu groups are the five sporadic simple groups ''M''11, ''M''12, ''M''22, ''M''23 and ''M''24 introduced by . They are multiply transitive permutation groups on 11, 12, 22, 23 or 24 objec ...
M11 is the smallest sporadic group
In mathematics, a sporadic group is one of the 26 exceptional groups found in the classification of finite simple groups.
A simple group is a group ''G'' that does not have any normal subgroups except for the trivial group and ''G'' itself. The ...
, defined as the sharply 4-transitive permutation group
In mathematics, a permutation group is a group ''G'' whose elements are permutations of a given set ''M'' and whose group operation is the composition of permutations in ''G'' (which are thought of as bijective functions from the set ''M'' to it ...
on 11 objects
Object may refer to:
General meanings
* Object (philosophy), a thing, being, or concept
** Object (abstract), an object which does not exist at any particular time or place
** Physical object, an identifiable collection of matter
* Goal, an ...
. It has order 7920 = 2432511 = 891011, with 11 as its largest prime factor, and a minimal faithful complex representation in 10 dimensions. Its group action
In mathematics, a group action on a space is a group homomorphism of a given group into the group of transformations of the space. Similarly, a group action on a mathematical structure is a group homomorphism of a group into the automorphism ...
is the automorphism group of Steiner system
250px, thumbnail, The Fano plane is a Steiner triple system S(2,3,7). The blocks are the 7 lines, each containing 3 points. Every pair of points belongs to a unique line.
In combinatorial mathematics, a Steiner system (named after Jakob Steiner) ...
S(4,5,11), with an induced action on unordered pairs of points that gives a rank 3 action
Rank is the relative position, value, worth, complexity, power, importance, authority, level, etc. of a person or object within a ranking, such as:
Level or position in a hierarchical organization
* Academic rank
* Diplomatic rank
* Hierarchy
* H ...
on 55 points. Mathieu group M12, on the other hand, is formed from the permutations of projective special linear group
In mathematics, especially in the group theoretic area of algebra, the projective linear group (also known as the projective general linear group or PGL) is the induced action of the general linear group of a vector space ''V'' on the associate ...
PSL2(11) with those of (2,10)(3,4)(5,9)(6,7). It is the second-smallest sporadic group, and holds M11 as a maximal subgroup
In mathematics, the term maximal subgroup is used to mean slightly different things in different areas of algebra.
In group theory, a maximal subgroup ''H'' of a group ''G'' is a proper subgroup, such that no proper subgroup ''K'' contains ''H'' s ...
and point stabilizer, with an order equal to 95040 = 2633511 = 89101112, where 11 is also its largest prime factor, like M11. M12 also centralizes an element of order 11 in the friendly giant, and has an irreducible faithful complex representation in 11 dimensions.
Within safe and Sophie Germain primes of the form 2''p'' + 1, 11 is the third safe prime
In number theory, a prime number ''p'' is a if 2''p'' + 1 is also prime. The number 2''p'' + 1 associated with a Sophie Germain prime is called a . For example, 11 is a Sophie Germain prime and 2 × 11 +  ...
, from a ''p'' of 5, and the fourth Sophie Germain prime, which yields 23 (number), 23.
In decimal
11 is the smallest two-digit prime number. On the seven-segment display of a calculator, it is both a strobogrammatic prime and a dihedral prime.
Multiples of 11 by one-digit numbers yield palindromic numbers with matching double digits: 0, 00, 11, 22 (number), 22, 33 (number), 33, 44 (number), 44, etc.
The sum of the first 11 non-zero positive integers, equivalently the 11th triangular number, is 66 (number), 66. On the other hand, the sum of the first 11 integers, from 0, zero to 10, ten, is 55.
The first four Power (mathematics), powers of 11 yield palindromic numbers: 111 = 11, 112 = 121, 113 = 1331, and 114 = 14641.
11 is the 11th Sequence, index or member in the sequence of palindromic numbers, and 121, equal to 11 x 11, is the 22nd.
The factorial of 11, 11factorial, ! = 39916800, has about a 0.2% difference to the round number 4 x 107, or 40 million. Among the first 100 factorials, the next closest to a round number is 96! ~ 9.91678 x 10149, which is about 0.8% less than 10149.
If a number is divisible by 11, reversing its digits will result in another multiple of 11. As long as no two adjacent digits of a number added together exceed 9, then multiplying the number by 11, reversing the digits of the product, and dividing that new number by 11 will yield a number that is the reverse of the original number; as in:
:142,312 × 11 = 1,565,432 → 2,345,651 ÷ 11 = 213,241.
Divisibility tests
A simple test to determine whether an integer is divisible by 11 is to take every digit of the number in an odd position and add them, then take the remaining digits and add them. If the difference between the two sums is a multiple of 11, including 0, then the number is divisible by 11. For instance, with the number 65,637:
This technique also works with groups of digits rather than individual digits, so long as the number of digits in each group is odd, although not all groups have to have the same number of digits. If one uses three digits in each group, one gets from 65,637 the calculation,
Another test for divisibility is to separate a number into groups of two consecutive digits (adding a leading zero if there is an odd number of digits), and then add the numbers so formed; if the result is divisible by 11, the number is divisible by 11:
This also works by adding a trailing zero instead of a leading one, and with larger groups of digits, provided that each group has an even number of digits (not all groups have to have the same number of digits):
Multiplying 11
An easy way to Multiplication, multiply numbers by 11 in base 10 is:
If the number has:
*1 digit, replicate the digit: 2 × 11 becomes 22.
*2 digits, add the 2 digits and place the result in the middle: 47 × 11 becomes 4 (11) 7 or 4 (10+1) 7 or (4+1) 1 7 or 517.
*3 digits, keep the first digit in its place for the result's first digit, add the first and second digits to form the result's second digit, add the second and third digits to form the result's third digit, and keep the third digit as the result's fourth digit. For any resulting numbers greater than 9, carry the 1 to the left. 123 × 11 becomes 1 (1+2) (2+3) 3 or 1353. 481 × 11 becomes 4 (4+8) (8+1) 1 or 4 (10+2) 9 1 or (4+1) 2 9 1 or 5291.
*4 or more digits, follow the same pattern as for 3 digits.
List of basic calculations
In other bases
In base 13 and higher bases (such as hexadecimal), 11 is represented as B, where ten is A. In duodecimal, 11 is sometimes represented as E or ↋, and ten as T, X, or ↊.
In science
*11 is the atomic number of the element sodium.
*In chemistry, Group 11 of the Periodic Table of the Elements (IUPAC numbering) consists of the three coinage metals copper, silver, and gold known from antiquity, and roentgenium, a recently synthesized superheavy element.
*The number of spacetime dimension
In physics and mathematics, the dimension of a Space (mathematics), mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any Point (geometry), point within it. Thus, a Line (geometry), lin ...
s in M-theory.
Astronomy
*Apollo 11 was the first crewed spacecraft to land on the Moon.
*A sunspot cycle's periodicity is approximately 11 years.
*Messier object Wild Duck Cluster, M11 is a visual magnitude, magnitude 7.0 open cluster in the constellation Scutum (constellation), Scutum, also known as the Wild Duck Cluster.
*The New General Catalogue object NGC 11 is a spiral galaxy in the constellation Andromeda (constellation), Andromeda.
*The 11th moon of Jupiter is Himalia (moon), Himalia.
In religion and spirituality
Christianity
After Judas Iscariot was disgraced, Jesus's remaining twelve Apostles, apostles were sometimes called "the Eleven" (; and ), even after Saint Matthias, Matthias was added to bring the number back to 12, as in Acts 2:14: ''Saint Peter, Peter stood up with the eleven'' (New International Version). The New Living Translation says ''Peter stepped forward with the eleven other apostles'', making clear that the number of apostles was now 12.
Saint Ursula is said to have been martyred in the 3rd or 4th century in Cologne with a number of companions, whose reported number "varies from five to eleven". A legend that Ursula died with 11,000 virgin companions has been thought to appear from misreading ''XI. M. V.'' (Latin abbreviation for "Eleven martyr virgins") as "Eleven thousand virgins".
Babylonian
In the Enûma Eliš the goddess Tiamat creates 11 monsters to avenge the death of her husband, Apsû.
Mysticism
The number 11 (alongside its multiples 22 and 33) are master numbers in numerology, especially in New Age. In astrology, Aquarius (astrology), Aquarius is the 11th astrological sign of the Zodiac.
In music
*The interval of an octave plus a fourth is an 11th. A complete 11th chord has almost every note of a diatonic scale.
*There are 11 thumb keys on a bassoon, not counting the whisper key. (A few bassoons have a 12th thumb key.)
*In the mockumentary ''This Is Spinal Tap'', Spinal Tap (band), Spinal Tap's amplifiers go up to eleven.
*In Igor Stravinsky's ''The Rite of Spring'', there are 11 consecutive repetitions of the same chord.
*In Tool (band), Tool's song "Jimmy" and in Negativland's song "Time Zones", the number 11 appears repeatedly in the lyrics.
* "Eleven pipers piping" is the gift on the 11th day of Christmas in the carol "The Twelve Days of Christmas (song), The Twelve Days of Christmas."
*In Green Grow the Rushes, O, Eleven is for "the eleven who went to heaven."
*"The Eleven" is a song by The Grateful Dead.
*In "Time Enough For Rocking When We're Old" by The Magnetic Fields, a lyric references "when our pheromones go up to eleven."
*Eleven Records is the record label of Jason Webley, and many of Webley's works feature the number 11.
* ''Eleven'' is the title of albums by:
**Come (American band), Come
** Incognito (band), incognito
** Martina McBride
** 22-Pistepirkko
** Eleven (band), Eleven
** Harry Connick Jr.
** Tina Arena
** Jeff Lorber and Mike Stern
** Reamonn
** Wagon Cookin'
** Mr. Fogg
** The Birdland Big Band
** Pearl Django
** Daniel Peña
** The Knux
** Igor Lumpert
** The_Smithereens, The Smithereens
In sports
* There are 11 players on an association football (soccer) team on the field at a time.
* An American football team also has 11 players on the field at one time during play. #11 is worn by quarterbacks, Placekicker, kickers, punter (football position), punters and wide receivers in American football's National Football League, NFL.
* There are 11 players on a bandy team on the ice at a time.
* In cricket, a team has 11 players on the field. The 11th player is usually the weakest batsman, at the tail-end. He is primarily in the team for his bowling abilities.
* There are 11 players in a field hockey team. The player wearing 11 will usually play on the left side, as in soccer.
* In NASCAR, NASCAR Racing, Denny Hamlin won his 11th race of the closest 2016 Daytona 500, Daytona 500 in car no. 11 by 0.01 seconds.
* In most rugby league competitions (but not the Super League, which uses static squad numbering), one of the starting second-row forwards wears the number 11.
* In rugby union, the starting left wing wears number 11.
In the military
*The number of guns in a gun salute to U.S. United States Army, Army, United States Air Force, Air Force and Marine Corps Brigadier Generals, and to United States Navy, Navy and United States Coast Guard, Coast Guard Rear Admirals Lower Half.
*The Military Occupational Specialty (MOS) designator given to US Army Infantry Officer as well as to enlisted personnel (AKA 11 MOS Series, or 11B, 11C, 11D, 11H, 11M, etc.)
*The number of General Orders for Sentries in the United States Marine Corps, Marine Corps and United States Navy.
*A page in the Service Record Book of an enlisted Marine for writing down disciplinary actions.
*World War I ended with an Armistice with Germany (Compiègne), Armistice on November 11, 1918, which went into effect at 11:00 am—the 11th hour on the 11th day of the 11th month of the year. Armistice Day is still observed on November 11 of each year, although it is now called Veterans Day (United States), Veterans Day in the U.S. and Remembrance Day in the Commonwealth of Nations and parts of Europe.
In computing
* In Mozilla Firefox, Opera (web browser), Opera, Konqueror for KDE, Google Chrome and Internet Explorer for Windows, the function key F11 key toggles full-screen viewing mode. In macOS, F11 hides all open windows.
* The windowing system for Unix computers is X11.
* Computers of the PDP-11 series from Digital Equipment Corporation were informally called "elevens".
* Windows 11
In Canada
* The stylized maple leaf on the Flag of Canada has 11 points.
* The loonie is a hendecagon, an 11-sided polygon.
* Clocks depicted on Canadian currency, like the Canadian fifty-dollar bill, Canadian 50-dollar bill, show 11:00.
In other fields
* Sector 11 in the North American Industry Classification System is the code for Agriculture, Forestry, Fishing and Hunting industries.
* Being one hour before 12:00, the ''eleventh hour'' means the last possible moment to take care of something, and often implies a situation of urgent danger or emergency (see Doomsday clock).
* In Basque language, Basque, ("eleven") has the double meaning of "Infinity, infinite", probably from Basque language, Basque ''amaigabe'', "endless", as in ("I told you infinite/eleven times to come!").
* English-speaking surveyors have developed several slang terms for 11 to distinguish it from its rhyme "seven", including "punk," "top," & "railroad".
*American Airlines Flight 11, a Boston-Los Angeles flight, crashed into the North Tower of the World Trade Center in New York City after terrorists hijacked it on September 11, 2001.
* The London Buses route 11, number 11 bus is a low-cost way to sightseeing, sightsee in London.
* In the game of blackjack, an ace can count as either one or 11, whichever is more advantageous for the player.
* 11 is the number of the French department Aude.
* Three films – ''Ben-Hur (1959 film), Ben-Hur'' (1959 in film, 1959), ''Titanic (1997 film), Titanic'' (1997 in film, 1997), and ''The Lord of the Rings: The Return of the King'' (2003 in film, 2003) – have each won 11 Academy Awards, including Academy Award for Best Picture, Best Picture.
* ''Ocean's Eleven'' is the name of two American films.
* In the anime series ''Code Geass'', Japan is known as Area 11 of the Brittanian Empire.
* Eleven (Stranger Things), Eleven is the name of a character in the 2016 Netflix original series ''Stranger Things'', portrayed by Millie Bobby Brown.
* Eleven (company), Eleven is a British television production company.
See also
*11:11 (disambiguation), 11:11
*11:11 (numerology)
*XI (disambiguation), XI
References
External links
*
{{DEFAULTSORT:11 (Number)
11 (number),
Integers