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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 n ...
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 settlement of Britain, Anglo ...
', which is first attested in
Bede Bede ( ; ang, Bǣda , ; 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 1 (one, unit, unity) is a number representing a single or the only entity. 1 is also a numerical digit and represents a single unit of counting or measurement. For example, a line segment of ''unit length'' is a line segment of length 1. I ...
") and suffix , of uncertain meaning. It is sometimes compared with the
Lithuanian Lithuanian may refer to: * Lithuanians * Lithuanian language * The country of Lithuania * Grand Duchy of Lithuania * Culture of Lithuania * Lithuanian cuisine * Lithuanian Jews as often called "Lithuanians" (''Lita'im'' or ''Litvaks'') by other Jew ...
', 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 settlement of Britain, Anglo ...
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 Ten, TEN or 10 may refer to: * 10, an even natural number following 9 and preceding 11 * one of the years 10 BC, AD 10, 1910 and 2010 * October, the tenth month of the year Places * Mount Ten, in Vietnam * Tongren Fenghuang Airport (IATA code ...
"); 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 ...
, 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 ...
\mathbb(\sqrt) 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 an ...
. 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 A hexomino (or 6-omino) is a polyomino of order 6, that is, a polygon in the plane made of 6 equal-sized squares connected edge-to-edge. The name of this type of figure is formed with the prefix hex(a)-. When rotations and reflections are not co ...
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 \Complex where ''q'' is constrained to , while 3 contain affine nodes and include infinite solutions, two in \Complex, and one in \Complex^2. * 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 Three-dimensional space (also: 3D space, 3-space or, rarely, tri-dimensional space) is a geometric setting in which three values (called ''parameters'') are required to determine the position of an element (i.e., point). This is the informal ...
(alongside 4 compact hyperbolic honeycombs). * 11 regular hyperbolic honeycombs in the fourth dimension: 9 compact solutions are generated from
regular 4-polytopes In mathematics, a regular 4-polytope is a regular four-dimensional polytope. They are the four-dimensional analogues of the regular polyhedra in three dimensions and the regular polygons in two dimensions. There are six convex and ten star re ...
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 Edge or EDGE may refer to: Technology Computing * Edge computing, a network load-balancing system * Edge device, an entry point to a computer network * Adobe Edge, a graphical development application * Microsoft Edge, a web browser developed by ...
, 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 In geometry, a 10-simplex is a self-dual regular 10-polytope. It has 11 vertices, 55 edges, 165 triangle faces, 330 tetrahedral cells, 462 5-cell 4-faces, 462 5-simplex 5-faces, 330 6-simplex 6-faces, 165 7-simplex 7-faces, 55 8-simplex 8-faces, ...
, 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 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 g ...
, 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 ''The Friendly Giant'' was a children's television program that aired on CBC Television from September 30, 1958 through to March 1985. It featured three main characters: a giant named Friendly (played by Bob Homme), who lived in a huge castle, alo ...
, and has an irreducible faithful complex representation in 11 dimensions. Within
safe and Sophie Germain primes 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 +  ...
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 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 +  ...
, which yields 23.


In decimal

11 is the smallest two-digit prime number. On the
seven-segment display A seven-segment display is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters, basic ...
of a calculator, it is both a
strobogrammatic prime A strobogrammatic number is a number whose numeral is rotationally symmetric, so that it appears the same when rotated 180 degrees. In other words, the numeral looks the same right-side up and upside down (e.g., 69, 96, 1001). A strobogrammatic ...
and a
dihedral prime A dihedral prime or dihedral calculator prime is a prime number that still reads like itself or another prime number when read in a seven-segment display, regardless of orientation (normally or upside down), and surface (actual display or reflectio ...
. Multiples of 11 by one-digit numbers yield
palindromic numbers A palindromic number (also known as a numeral palindrome or a numeric palindrome) is a number (such as 16461) that remains the same when its digits are reversed. In other words, it has reflectional symmetry across a vertical axis. The term ''palin ...
with matching double digits: 00, 11, 22, 33, 44, etc. The sum of the first 11 non-zero positive
integer An integer is the number zero (), a positive natural number (, , , etc.) or a negative integer with a minus sign (−1, −2, −3, etc.). The negative numbers are the additive inverses of the corresponding positive numbers. In the language ...
s, equivalently the 11th
triangular number A triangular number or triangle number counts objects arranged in an equilateral triangle. Triangular numbers are a type of figurate number, other examples being square numbers and cube numbers. The th triangular number is the number of dots in ...
, is 66. On the other hand, the sum of the first 11 integers, from
zero 0 (zero) is a number representing an empty quantity. In place-value notation Positional notation (or place-value notation, or positional numeral system) usually denotes the extension to any base of the Hindu–Arabic numeral system (or ...
to
ten Ten, TEN or 10 may refer to: * 10, an even natural number following 9 and preceding 11 * one of the years 10 BC, AD 10, 1910 and 2010 * October, the tenth month of the year Places * Mount Ten, in Vietnam * Tongren Fenghuang Airport (IATA code ...
, is 55. The first four powers of 11 yield palindromic numbers: 111 = 11, 112 = 121, 113 = 1331, and 114 = 14641. 11 is the 11th
index Index (or its plural form indices) may refer to: Arts, entertainment, and media Fictional entities * Index (''A Certain Magical Index''), a character in the light novel series ''A Certain Magical Index'' * The Index, an item on a Halo megastru ...
or member in the sequence of palindromic numbers, and 121, equal to 11 x 11, is the 22nd. The
factorial In mathematics, the factorial of a non-negative denoted is the product of all positive integers less than or equal The factorial also equals the product of n with the next smaller factorial: \begin n! &= n \times (n-1) \times (n-2) \t ...
of 11, 11 ! = 39916800, has about a 0.2% difference to the
round number A round number is an integer that ends with one or more " 0"s (zero-digit) in a given base. So, 590 is rounder than 592, but 590 is less round than 600. In both technical and informal language, a round number is often interpreted to stand for a ...
4 x 107, or 40
million One million (1,000,000), or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian ''millione'' (''milione'' in modern Italian), from ''mille'', "thousand", plus the au ...
. 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
multiply Multiplication (often denoted by the cross symbol , by the mid-line dot operator , by juxtaposition, or, on computers, by an asterisk ) is one of the four elementary mathematical operations of arithmetic, with the other ones being additi ...
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 In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of 16. Unlike the decimal system representing numbers using 10 symbols, hexa ...
), 11 is represented as B, where ten is A. In
duodecimal The duodecimal system (also known as base 12, dozenal, or, rarely, uncial) is a positional notation numeral system using twelve as its base. The number twelve (that is, the number written as "12" in the decimal numerical system) is instead wri ...
, 11 is sometimes represented as E or ↋, and ten as T, X, or ↊.


In science

*11 is the
atomic number The atomic number or nuclear charge number (symbol ''Z'') of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei, this is equal to the proton number (''n''p) or the number of protons found in the nucleus of every ...
of the element
sodium Sodium is a chemical element with the symbol Na (from Latin ''natrium'') and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable iso ...
. *In chemistry, Group 11 of the
Periodic Table of the Elements The periodic table, also known as the periodic table of the (chemical) elements, is a rows and columns arrangement of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of c ...
(
IUPAC The International Union of Pure and Applied Chemistry (IUPAC ) is an international federation of National Adhering Organizations working for the advancement of the chemical sciences, especially by developing nomenclature and terminology. It is ...
numbering) consists of the three coinage metals
copper Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkis ...
,
silver Silver is a chemical element with the Symbol (chemistry), symbol Ag (from the Latin ', derived from the Proto-Indo-European wikt:Reconstruction:Proto-Indo-European/h₂erǵ-, ''h₂erǵ'': "shiny" or "white") and atomic number 47. A soft, whi ...
, and
gold Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile met ...
known from antiquity, and
roentgenium Roentgenium is a chemical element with the symbol Rg and atomic number 111. It is an extremely radioactive synthetic element that can be created in a laboratory but is not found in nature. The most stable known isotope, roentgenium-282, has a h ...
, a recently synthesized superheavy element. *The number of
spacetime In physics, spacetime is a mathematical model that combines the three dimensions of space and one dimension of time into a single four-dimensional manifold. Spacetime diagrams can be used to visualize relativistic effects, such as why differen ...
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 M-theory is a theory in physics that unifies all consistent versions of superstring theory. Edward Witten first conjectured the existence of such a theory at a string theory conference at the University of Southern California in 1995. Witten's ...
.


Astronomy

*
Apollo 11 Apollo 11 (July 16–24, 1969) was the American spaceflight that first landed humans on the Moon. Commander Neil Armstrong and lunar module pilot Buzz Aldrin landed the Apollo Lunar Module ''Eagle'' on July 20, 1969, at 20:17 UTC, an ...
was the first crewed spacecraft to land on the
Moon The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of ...
. *A
sunspot cycle The solar cycle, also known as the solar magnetic activity cycle, sunspot cycle, or Schwabe cycle, is a nearly periodic 11-year change in the Sun's activity measured in terms of variations in the number of observed sunspots on the Sun's surfac ...
's periodicity is approximately 11 years. *
Messier object The Messier objects are a set of 110 astronomical objects catalogued by the French astronomer Charles Messier in his ''Catalogue des Nébuleuses et des Amas d'Étoiles'' (''Catalogue of Nebulae and Star Clusters''). Because Messier was only int ...
M11 is a
magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...
7.0
open cluster An open cluster is a type of star cluster made of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way galaxy, and ...
in the constellation
Scutum The ''scutum'' (; plural ''scuta'') was a type of shield used among Italic peoples in antiquity, most notably by the army of ancient Rome starting about the fourth century BC. The Romans adopted it when they switched from the military formati ...
, also known as the
Wild Duck Cluster The Wild Duck Cluster (also known as Messier 11, or NGC 6705) is an open cluster of stars in the constellation Scutum (the Shield). It was discovered by Gottfried Kirch in 1681. Charles Messier included it in his catalogue of diffuse objects in 1 ...
. *The
New General Catalogue The ''New General Catalogue of Nebulae and Clusters of Stars'' (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and ...
object
NGC 11 NGC commonly refers to: * New General Catalogue of Nebulae and Clusters of Stars, a catalogue of deep sky objects in astronomy NGC may also refer to: Companies * NGC Corporation, name of US electric company Dynegy, Inc. from 1995 to 1998 * Na ...
is a
spiral galaxy Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work ''The Realm of the Nebulae''constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...
Andromeda. *The 11th moon of
Jupiter Jupiter is the fifth planet from the Sun and the List of Solar System objects by size, largest in the Solar System. It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined, but ...
is Himalia.


In religion and spirituality


Christianity

After
Judas Iscariot Judas Iscariot (; grc-x-biblical, Ἰούδας Ἰσκαριώτης; syc, ܝܗܘܕܐ ܣܟܪܝܘܛܐ; died AD) was a disciple and one of the original Twelve Apostles of Jesus Christ. According to all four canonical gospels, Judas betraye ...
was disgraced,
Jesus Jesus, likely from he, יֵשׁוּעַ, translit=Yēšūaʿ, label=Hebrew/Aramaic ( AD 30 or 33), also referred to as Jesus Christ or Jesus of Nazareth (among other names and titles), was a first-century Jewish preacher and religious ...
's remaining
apostles An apostle (), in its literal sense, is an emissary, from Ancient Greek ἀπόστολος (''apóstolos''), literally "one who is sent off", from the verb ἀποστέλλειν (''apostéllein''), "to send off". The purpose of such sending ...
were sometimes called "the Eleven" (; and ), even after
Matthias Matthias is a name derived from the Greek Ματθαίος, in origin similar to Matthew. People Notable people named Matthias include the following: In religion: * Saint Matthias, chosen as an apostle in Acts 1:21–26 to replace Judas Iscariot * ...
was added to bring the number back to 12, as in Acts 2:14: ''
Peter Peter may refer to: People * List of people named Peter, a list of people and fictional characters with the given name * Peter (given name) ** Saint Peter (died 60s), apostle of Jesus, leader of the early Christian Church * Peter (surname), a sur ...
stood up with the eleven'' (
New International Version The New International Version (NIV) is an English translation of the Bible first published in 1978 by Biblica (formerly the International Bible Society). The ''NIV'' was created as a modern translation, by Bible scholars using the earliest an ...
). The
New Living Translation The New Living Translation (NLT) is an Bible translations into English, English translation of the Bible. The origin of the NLT came from a project aiming to revise ''The Living Bible'' (TLB). This effort eventually led to the creation of the ...
says ''Peter stepped forward with the eleven other apostles'', making clear that the number of apostles was now 12.
Saint Ursula Saint Ursula (Latin for 'little female bear', german: link=no, Heilige Ursula) is a legendary Romano-British Christian saint who died on 21 October 383. Her feast day in the pre-1970 General Roman Calendar is 21 October. There is little infor ...
is said to have been martyred in the 3rd or 4th century in
Cologne Cologne ( ; german: Köln ; ksh, Kölle ) is the largest city of the German western States of Germany, state of North Rhine-Westphalia (NRW) and the List of cities in Germany by population, fourth-most populous city of Germany with 1.1 m ...
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 Numerology (also known as arithmancy) is the belief in an occult, divine or mystical relationship between a number and one or more coinciding events. It is also the study of the numerical value, via an alphanumeric system, of the letters in ...
, especially in
New Age New Age is a range of spiritual or religious practices and beliefs which rapidly grew in Western society during the early 1970s. Its highly eclectic and unsystematic structure makes a precise definition difficult. Although many scholars conside ...
. In
astrology Astrology is a range of Divination, divinatory practices, recognized as pseudoscientific since the 18th century, that claim to discern information about human affairs and terrestrial events by studying the apparent positions of Celestial o ...
,
Aquarius Aquarius may refer to: Astrology * Aquarius (astrology), an astrological sign * Age of Aquarius, a time period in the cycle of astrological ages Astronomy * Aquarius (constellation) * Aquarius in Chinese astronomy Arts and entertainment ...
is the 11th
astrological sign In Western astrology, astrological signs are the twelve 30-degree sectors that make up Earth's 360-degree orbit around the Sun. The signs enumerate from the first day of spring, known as the First Point of Aries, which is the vernal equinox. ...
of the
Zodiac The zodiac is a belt-shaped region of the sky that extends approximately 8° north or south (as measured in celestial latitude) of the ecliptic, the Sun path, apparent path of the Sun across the celestial sphere over the course of the year. ...
.


In music

*The interval of an
octave In music, an octave ( la, octavus: eighth) or perfect octave (sometimes called the diapason) is the interval between one musical pitch and another with double its frequency. The octave relationship is a natural phenomenon that has been refer ...
plus a fourth is an 11th. A complete 11th chord has almost every note of a
diatonic scale In music theory, a diatonic scale is any heptatonic scale that includes five whole steps (whole tones) and two half steps (semitones) in each octave, in which the two half steps are separated from each other by either two or three whole steps, ...
. *There are 11 thumb keys on a
bassoon The bassoon is a woodwind instrument in the double reed family, which plays in the tenor and bass ranges. It is composed of six pieces, and is usually made of wood. It is known for its distinctive tone color, wide range, versatility, and virtuo ...
, not counting the whisper key. (A few bassoons have a 12th thumb key.) *In the mockumentary ''
This Is Spinal Tap ''This Is Spinal Tap'' (also known as ''This Is Spınal Tap: A Rockumentary by Martin Di Bergi'') is a 1984 American mockumentary film co-written and directed by Rob Reiner (in his feature directorial debut). The film stars Christopher Guest, M ...
'', Spinal Tap's amplifiers go
up to eleven "Up to eleven", also phrased as "these go to eleven", is an idiom from popular culture, coined in the 1984 film ''This Is Spinal Tap,'' where guitarist Nigel Tufnel demonstrates an amplifier whose volume knobs are marked from zero to eleven, ins ...
. *In Igor Stravinsky's ''
The Rite of Spring ''The Rite of Spring''. Full name: ''The Rite of Spring: Pictures from Pagan Russia in Two Parts'' (french: Le Sacre du printemps: tableaux de la Russie païenne en deux parties) (french: Le Sacre du printemps, link=no) is a ballet and orchestral ...
'', there are 11 consecutive repetitions of the same chord. *In Tool's song "Jimmy" and in
Negativland Negativland is an American experimental music band which originated in the San Francisco Bay Area in the late 1970s. They took their name from a Neu! track, while their record label (Seeland Records) is named after another Neu! track. The core ...
'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 The Twelve Days of Christmas, also known as Twelvetide, is a festive Christian season celebrating the Nativity of Jesus. In some Western ecclesiastical traditions, "Christmas Day" is considered the "First Day of Christmas" and the Twelve Days a ...
." *In
Green Grow the Rushes, O Green Grow the Rushes, O (alternatively "Ho" or "Oh") (also known as "The Twelve Prophets", "The Carol of the Twelve Numbers", "The Teaching Song", "The Dilly Song", or "The Ten Commandments"), is an English folk song (Roud #133). It is sometimes ...
, Eleven is for "the eleven who went to heaven." *"
The Eleven ''Live/Dead'' is the first official live album released by the rock band Grateful Dead. Recorded over a series of concerts in early 1969 and released later the same year, it was the first live rock album to use 16-track recording. In 2005 the tr ...
" is a song by The Grateful Dead. *In "Time Enough For Rocking When We're Old" by
The Magnetic Fields The Magnetic Fields (named after the André Breton/Philippe Soupault novel ''Les Champs Magnétiques'') are an American Band (rock and pop), band founded and led by Stephin Merritt. Merritt is the group's primary songwriter, producer, and vocali ...
, a lyric references "when our pheromones go up to eleven." *Eleven Records is the record label of
Jason Webley Jason Webley is an American musician known for his sincere fusion of folk, experimental, and alternative music. Webley plays the guitar and accordion, sometimes providing percussion by stomping or shaking a plastic vodka bottle filled with coins. ...
, and many of Webley's works feature the number 11. * ''Eleven'' is the title of albums by: **
Come Come may refer to: *Comè, a city and commune in Benin *Come (Tenos), an ancient town on Tenos island, Greece Music *Come (American band), an American indie rock band formed in 1990 *Come (UK band), a British noise project founded in 1979 **Come ...
**
incognito Incognito is an English adjective meaning "in disguise", "having taken steps to conceal one's identity". Incognito may also refer to: Film and television * ''Incognito'' (1937 film), a Danish film * ''Incognito'' (1997 film), an American crime ...
**
Martina McBride Martina Mariea McBride (née Schiff, born July 29, 1966) is an American country music singer-songwriter and record producer. She is known for her soprano singing range and her country pop material. McBride was born in Sharon, Kansas, and relocat ...
**
22-Pistepirkko 22-Pistepirkko, (), is a Finnish popular music band formed in 1980. It was formed in a small rural village of Utajärvi in Northern Finland but moved to Helsinki, the capital of Finland, in 1985. The band now produces music in English, though at ...
**
Eleven Eleven or 11 may refer to: *11 (number), the natural number following 10 and preceding 12 * one of the years 11 BC, AD 11, 1911, 2011, or any year ending in 11 Literature * ''Eleven'' (novel), a 2006 novel by British author David Llewellyn *'' ...
**
Harry Connick Jr. Joseph Harry Fowler Connick Jr. (born September 11, 1967) is an American singer, pianist, composer, actor, and television host. He has sold over 28million albums worldwide. Connick is ranked among the top60 best-selling male artists in the Uni ...
**
Tina Arena Filippina Lydia "Tina" Arena (born 1 November 1967) is an Australian singer-songwriter, musician, musical theatre actress and record producer. She is one of Australia's highest-selling artists and has sold over 10 million records worldwid ...
**
Jeff Lorber Jeffrey H. Lorber (born November 4, 1952) is an American keyboardist, composer, and record producer. After six previous nominations, Lorber won his first Grammy Award on January 28, 2018 for Best Contemporary Instrumental Album for '' Prototype' ...
and
Mike Stern Mike Stern (born January 10, 1953) is an American jazz guitarist. After playing with Blood, Sweat & Tears, he worked with drummer Billy Cobham, then with trumpeter Miles Davis from 1981 to 1983 and again in 1985. He then began a solo career, re ...
**
Reamonn Reamonn was a German pop rock band fronted by local-based Irish singer/songwriter Rea Garvey. Formed in 1999, they have recorded and released a total of six full-length studio albums which were highly successful in Germany and also saw some succ ...
** Wagon Cookin' **
Mr. Fogg Mr Fogg is an English electronic musician from Reading, Berkshire, England. He is the grandson of an opera singer and the great grandson of two 19th Century music-hall performers. Origin of name Mr Fogg derives his name from Phileas Fogg, the ...
**
The Birdland Big Band The Birdland Big Band is a 16-piece jazz orchestra that performs at the Birdland Jazz Club in New York City. The Birdland Big Band is led by saxophonist David DeJesus DeJesus joined as saxophonist and leader in October 2017 and brought with him a ...
**
Pearl Django Pearl Django is a jazz group established in 1994 in Tacoma, Washington by guitarists Neil Andersson and Dudley Hill and bassist David "Pope" Firman. The group melds the music of Django Reinhardt and Stephane Grappelli with American Swing. Initial ...
** Daniel Peña **
The Knux The Knux are an American alternative hip hop duo, formed in 2003, composed of brothers Kentrell "Krispy" Lindsey (formerly known as Krispy Kream) and Alvin "Joey" Lindsey (formerly known as Rah Al Millio). Both brothers are multi-instrumentali ...
**
Igor Lumpert Igor Lumpert (born October 27, 1975) is a Slovene jazz saxophonist. Lumpert began his professional training at age 19 at the Bruckner Conservatory in Linz, Austria, where he studied with Doug Hammond and Harry Sokal. During this period, he was ...
**
The Smithereens The Smithereens are an American rock band from Carteret, New Jersey, United States. The group formed in 1980 with members Pat DiNizio (vocals & guitar), Jim Babjak (guitar & vocals), Mike Mesaros (bass guitar & vocals), and Dennis Diken (drums & ...


In sports

* There are 11 players on an
association football Association football, more commonly known as football or soccer, is a team sport played between two teams of 11 players who primarily use their feet to propel the ball around a rectangular field called a pitch. The objective of the game is ...
(soccer) team on the field at a time. * An
American football American football (referred to simply as football in the United States and Canada), also known as gridiron, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end. The offense, the team with ...
team also has 11 players on the field at one time during play. #11 is worn by
quarterback The quarterback (commonly abbreviated "QB"), colloquially known as the "signal caller", is a position in gridiron football. Quarterbacks are members of the offensive platoon and mostly line up directly behind the offensive line. In modern Ame ...
s,
kickers Kickers is a youth brand created in 1970 in France that produces a wide range of footwear and clothing. Kickers was bought in 2007 by the Royer group. Kickers are primarily popular amongst British school children, with Kickers 'Lo' style shoe ...
, punters and wide receivers in American football's
NFL The National Football League (NFL) is a professional American football league that consists of 32 teams, divided equally between the American Football Conference (AFC) and the National Football Conference (NFC). The NFL is one of the major ...
. * There are 11 players on a
bandy Bandy is a winter sport and ball sport played by two teams wearing ice skates on a large ice surface (either indoors or outdoors) while using sticks to direct a ball into the opposing team's goal. The international governing body for bandy is ...
team on the ice at a time. * In
cricket Cricket is a bat-and-ball game played between two teams of eleven players on a field at the centre of which is a pitch with a wicket at each end, each comprising two bails balanced on three stumps. The batting side scores runs by striki ...
, a team has 11 players on the field. The 11th player is usually the weakest batsman, at the
tail-end In cricket, the batting order is the sequence in which batters play through their team's innings, there always being two batters taking part at any one time. All eleven players in a team are required to bat if the innings is completed (i.e., i ...
. He is primarily in the team for his bowling abilities. * There are 11 players in a
field hockey Field hockey is a team sport structured in standard hockey format, in which each team plays with ten outfield players and a goalkeeper. Teams must drive a round hockey ball by hitting it with a hockey stick towards the rival team's shooting ci ...
team. The player wearing 11 will usually play on the left side, as in soccer. * In
NASCAR Racing ''NASCAR Racing'' is a series of car racing video games originally developed by Papyrus Design Group in the 1990s. The series started in 1994 and ended with the release of ''NASCAR Racing 2003 Season'' in 2003. Later NASCAR games were released b ...
,
Denny Hamlin James Dennis Alan Hamlin (born November 18, 1980) is an American professional stock car racing driver and NASCAR team owner. He competes full-time in the NASCAR Cup Series, driving the No. 11 Toyota Camry for Joe Gibbs Racing. He co-owns and oper ...
won his 11th race of the closest
Daytona 500 The Daytona 500 is a NASCAR Cup Series motor race held annually at Daytona International Speedway in Daytona Beach, Florida. It is the first of two Cup races held every year at Daytona, the second being the Coke Zero Sugar 400, and one of three ...
in car no. 11 by 0.01 seconds. * In most
rugby league Rugby league football, commonly known as just rugby league and sometimes football, footy, rugby or league, is a full-contact sport played by two teams of thirteen players on a rectangular field measuring 68 metres (75 yards) wide and 112 ...
competitions (but not the
Super League The Super League (officially known as the Betfred Super League due to sponsorship from Betfred and legally known as Super League Europe), is the top-level of the British rugby league system. At present the league consists of twelve teams, of wh ...
, which uses static squad numbering), one of the starting second-row forwards wears the number 11. * In
rugby union Rugby union, commonly known simply as rugby, is a close-contact team sport that originated at Rugby School in the first half of the 19th century. One of the two codes of rugby football, it is based on running with the ball in hand. In its m ...
, the starting left wing wears number 11.


In the military

*The number of guns in a gun
salute A salute is usually a formal hand gesture or other action used to display respect in military situations. Salutes are primarily associated with the military and law enforcement, but many civilian organizations, such as Girl Guides, Boy Sco ...
to U.S.
Army An army (from Old French ''armee'', itself derived from the Latin verb ''armāre'', meaning "to arm", and related to the Latin noun ''arma'', meaning "arms" or "weapons"), ground force or land force is a fighting force that fights primarily on ...
,
Air Force An air force – in the broadest sense – is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an a ...
and Marine Corps Brigadier Generals, and to
Navy A navy, naval force, or maritime force is the branch of a nation's armed forces principally designated for naval warfare, naval and amphibious warfare; namely, lake-borne, riverine, littoral zone, littoral, or ocean-borne combat operations and ...
and
Coast Guard A coast guard or coastguard is a maritime security organization of a particular country. The term embraces wide range of responsibilities in different countries, from being a heavily armed military force with customs and security duties to ...
Rear Admirals Lower Half. *The
Military Occupational Specialty A United States military occupation code, or a military occupational specialty code (MOS code), is a nine-character code used in the United States Army and United States Marine Corps to identify a specific job. In the United States Air Force, a sy ...
(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 Orders to Sentry is the official title of a set of rules governing sentry (guard or watch) duty in the United States Armed Forces. While any guard posting has rules that may go without saying ("Stay awake," for instance), these orders are carefully ...
in the
Marine Corps Marines, or naval infantry, are typically a military force trained to operate in littoral zones in support of naval operations. Historically, tasks undertaken by marines have included helping maintain discipline and order aboard the ship (refle ...
and
United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...
. *A page in the Service Record Book of an enlisted Marine for writing down disciplinary actions. *
World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
ended with an
Armistice An armistice is a formal agreement of warring parties to stop fighting. It is not necessarily the end of a war, as it may constitute only a cessation of hostilities while an attempt is made to negotiate a lasting peace. It is derived from the La ...
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 Armistice Day, later known as Remembrance Day in the Commonwealth and Veterans Day in the United States, is commemorated every year on 11 November to mark Armistice of 11 November 1918, the armistice signed between the Allies of World War I a ...
is still observed on November 11 of each year, although it is now called
Veterans Day Veterans Day (originally known as Armistice Day) is a federal holiday in the United States observed annually on November 11, for honoring military veterans of the United States Armed Forces (who were discharged under conditions other than di ...
in the U.S. and
Remembrance Day Remembrance Day (also known as Poppy Day owing to the tradition of wearing a remembrance poppy) is a memorial day observed in Commonwealth member states since the end of the First World War to honour armed forces members who have died in t ...
in the
Commonwealth of Nations The Commonwealth of Nations, simply referred to as the Commonwealth, is a political association of 56 member states, the vast majority of which are former territories of the British Empire. The chief institutions of the organisation are the Co ...
and parts of Europe.


In computing

* In
Mozilla Firefox Mozilla Firefox, or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. It uses the Gecko rendering engine to display web pages, which implements current and a ...
,
Opera Opera is a form of theatre in which music is a fundamental component and dramatic roles are taken by singers. Such a "work" (the literal translation of the Italian word "opera") is typically a collaboration between a composer and a librett ...
,
Konqueror Konqueror is a free and open-source web browser and file manager that provides web access and file-viewer functionality for file systems (such as local files, files on a remote FTP server and files in a disk image). It forms a core part of ...
for
KDE KDE is an international Free software movement, free software community that develops free and open-source software. As a central development hub, it provides tools and resources that allow collaborative work on this kind of software. Well-know ...
,
Google Chrome Google Chrome is a cross-platform web browser developed by Google. It was first released in 2008 for Microsoft Windows, built with free software components from Apple WebKit and Mozilla Firefox. Versions were later released for Linux, macOS ...
and
Internet Explorer Internet Explorer (formerly Microsoft Internet Explorer and Windows Internet Explorer, commonly abbreviated IE or MSIE) is a series of graphical user interface, graphical web browsers developed by Microsoft which was used in the Microsoft Wind ...
for Windows, the
function key A function key is a key on a computer or terminal keyboard that can be programmed so as to cause an operating system command interpreter or application program to perform certain actions, a form of soft key. On some keyboards/computers, function ...
F11 key toggles full-screen viewing mode. In
macOS macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and lapt ...
, F11 hides all open windows. * The windowing system for
Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and ot ...
computers is
X11 The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like operating systems. X provides the basic framework for a GUI environment: drawing and moving windows on the display device and interacting wit ...
. * Computers of the
PDP-11 The PDP-11 is a series of 16-bit minicomputers sold by Digital Equipment Corporation (DEC) from 1970 into the 1990s, one of a set of products in the Programmed Data Processor (PDP) series. In total, around 600,000 PDP-11s of all models were sold, ...
series from
Digital Equipment Corporation Digital Equipment Corporation (DEC ), using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s. The company was co-founded by Ken Olsen and Harlan Anderson in 1957. Olsen was president unt ...
were informally called "elevens". *
Windows 11 Windows 11 is the latest major release of Microsoft's Windows NT operating system, released in October 2021. It is a free upgrade to its predecessor, Windows 10 (2015), and is available for any Windows 10 devices that meet the new Windows 11 ...


In Canada

* The stylized maple leaf on the
Flag of Canada The national flag of Canada (french: le Drapeau national du Canada), often simply referred to as the Canadian flag or, unofficially, as the Maple Leaf or ' (; ), consists of a red field with a white square at its centre in the ratio of , in ...
has 11 points. * The
loonie The loonie (french: huard), formally the Canadian one-dollar coin, is a gold-coloured Canadian coin that was introduced in 1987 and is produced by the Royal Canadian Mint at its facility in Winnipeg. The most prevalent versions of the coin sh ...
is a
hendecagon In geometry, a hendecagon (also undecagon or endecagon) or 11-gon is an eleven-sided polygon. (The name ''hendecagon'', from Greek ''hendeka'' "eleven" and ''–gon'' "corner", is often preferred to the hybrid ''undecagon'', whose first part is f ...
, an 11-sided polygon. * Clocks depicted on Canadian currency, like the Canadian 50-dollar bill, show 11:00.


In other fields

* Sector 11 in the
North American Industry Classification System The North American Industry Classification System or NAICS () is a classification of business establishments by type of economic activity (process of production). It is used by government and business in Canada, Mexico, and the United States of A ...
is the code for
Agriculture Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to ...
,
Forestry Forestry is the science and craft of creating, managing, planting, using, conserving and repairing forests, woodlands, and associated resources for human and environmental benefits. Forestry is practiced in plantations and natural stands. Th ...
,
Fishing Fishing is the activity of trying to catch fish. Fish are often caught as wildlife from the natural environment, but may also be caught from stocked bodies of water such as ponds, canals, park wetlands and reservoirs. Fishing techniques inclu ...
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 The Doomsday Clock is a symbol that represents the likelihood of a man-made global catastrophe, in the opinion of the members of the ''Bulletin of the Atomic Scientists''. Maintained since 1947, the clock is a metaphor for threats to humanity ...
). * In
Basque Basque may refer to: * Basques, an ethnic group of Spain and France * Basque language, their language Places * Basque Country (greater region), the homeland of the Basque people with parts in both Spain and France * Basque Country (autonomous co ...
, ("eleven") has the double meaning of "
infinite Infinite may refer to: Mathematics *Infinite set, a set that is not a finite set *Infinity, an abstract concept describing something without any limit Music * Infinite (group), a South Korean boy band *''Infinite'' (EP), debut EP of American m ...
", probably from
Basque Basque may refer to: * Basques, an ethnic group of Spain and France * Basque language, their language Places * Basque Country (greater region), the homeland of the Basque people with parts in both Spain and France * Basque Country (autonomous co ...
''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 American Airlines Flight 11 was a domestic passenger flight that was hijacked by five al-Qaeda terrorists on September 11, 2001 as part of the September 11 attacks. Lead hijacker Mohamed Atta deliberately crashed the plane into the North Tower ...
, a
Boston Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- mo ...
-
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world' ...
flight, crashed into the North Tower of the World Trade Center in
New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...
after terrorists hijacked it on September 11, 2001. * The number 11 bus is a low-cost way to sightsee in
London London is the capital and largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary down to the North Sea, and has been a majo ...
. * In the game of
blackjack Blackjack (formerly Black Jack and Vingt-Un) is a casino banking game. The most widely played casino banking game in the world, it uses decks of 52 cards and descends from a global family of casino banking games known as Twenty-One. This fami ...
, 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 Aude (; ) is a Departments of France, department in Southern France, located in the Occitania (administrative region), Occitanie Regions of France, region and named after the river Aude (river), Aude. The departmental council also calls it "Ca ...
. * Three films – '' Ben-Hur'' (
1959 Events January * January 1 - Cuba: Fulgencio Batista flees Havana when the forces of Fidel Castro advance. * January 2 - Lunar probe Luna 1 was the first man-made object to attain escape velocity from Earth. It reached the vicinity of E ...
), ''
Titanic RMS ''Titanic'' was a British passenger liner, operated by the White Star Line, which sank in the North Atlantic Ocean on 15 April 1912 after striking an iceberg during her maiden voyage from Southampton, England, to New York City, United ...
'' (
1997 File:1997 Events Collage.png, From left, clockwise: The movie set of ''Titanic'', the highest-grossing movie in history at the time; ''Harry Potter and the Philosopher's Stone'', is published; Comet Hale-Bopp passes by Earth and becomes one of t ...
), and '' The Lord of the Rings: The Return of the King'' (
2003 File:2003 Events Collage.png, From top left, clockwise: The crew of STS-107 perished when the Space Shuttle Columbia disintegrated during reentry into Earth's atmosphere; SARS became an epidemic in China, and was a precursor to SARS-CoV-2; A des ...
) – have each won 11
Academy Awards The Academy Awards, better known as the Oscars, are awards for artistic and technical merit for the American and international film industry. The awards are regarded by many as the most prestigious, significant awards in the entertainment ind ...
, including
Best Picture This is a list of categories of awards commonly awarded through organizations that bestow film awards, including those presented by various film, festivals, and people's awards. Best Actor/Best Actress *See Best Actor#Film awards, Best Actress#F ...
. * ''
Ocean's Eleven ''Ocean's Eleven'' is a 2001 American heist comedy film directed by Steven Soderbergh from a screenplay by Ted Griffin. The first installment in the ''Ocean's'' film trilogy, it is a remake of the 1960 Rat Pack film of the same name. The fil ...
'' is the name of two
American films This is a list of films produced by the American film industry from the earliest films of the 1890s to the present. Films are listed by year of release on separate pages, either in alphabetical order (1900–2013) or in chronological order (2 ...
. * In the anime series ''
Code Geass , often referred to simply as ''Code Geass'', is a Japanese anime television series produced by Sunrise. It was directed by Gorō Taniguchi and written by Ichirō Ōkouchi, with original character designs by Clamp. Set ...
'', Japan is known as Area 11 of the Brittanian Empire. *
Eleven Eleven or 11 may refer to: *11 (number), the natural number following 10 and preceding 12 * one of the years 11 BC, AD 11, 1911, 2011, or any year ending in 11 Literature * ''Eleven'' (novel), a 2006 novel by British author David Llewellyn *'' ...
is the name of a character in the 2016
Netflix Netflix, Inc. is an American subscription video on-demand over-the-top streaming service and production company based in Los Gatos, California. Founded in 1997 by Reed Hastings and Marc Randolph in Scotts Valley, California, it offers a fil ...
original series ''
Stranger Things ''Stranger Things'' is an American science fiction horror drama television series created by the Duffer Brothers, who also serve as showrunners and are executive producers along with Shawn Levy and Dan Cohen. Produced by Monkey Massacre Prod ...
'', portrayed by
Millie Bobby Brown Millie Bobby Brown (born 19 February 2004) is a British actress and producer. She gained recognition for playing Eleven in the Netflix science fiction series ''Stranger Things'' (2016–present), for which she received nominations for two Prime ...
. *
Eleven Eleven or 11 may refer to: *11 (number), the natural number following 10 and preceding 12 * one of the years 11 BC, AD 11, 1911, 2011, or any year ending in 11 Literature * ''Eleven'' (novel), a 2006 novel by British author David Llewellyn *'' ...
is a British television production company.


See also

*
11:11 11:11, 11-11, or 11/11 may refer to: * 11:11 (numerology) *''Eleven Eleven'', the literary journal of California College of the Arts *11.11, also known as Singles Day, a day for unmarried people, popular among Chinese youth *Double eleven (11.11) s ...
* 11:11 (numerology) * XI


References


External links

* {{DEFAULTSORT:11 (Number) Integers