7 (number)

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7
0 1 2 3 4 5 6 7 8 9 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	7 seven
Ordinal	7th seventh
Numeral system	septenary
Factorization	prime
Divisors	1, 7
Roman numeral	VII
Roman numeral (Unicode)	Ⅶ, ⅶ
Amharic	፯
Indian	٧
Bengali	৭
Chinese numeral	七，柒
Devanāgarī	७
Hebrew	ז (Zayin)
Khmer	៧
Thai	๗
prefixes	hepta-/hept- (from Greek) septua- (from Latin)
Binary	111
Octal	7
Duodecimal	7
Hexadecimal	7

7 (seven) is the natural number following 6 and preceding 8.

Contents 1 In mathematics 1.1 In numeral systems 1.2 List of basic calculations 2 Evolution of the glyph 3 In science 3.1 Physics 3.2 Chemistry 3.3 Astronomy 4 In technology 5 In the classical world 6 In religion 7 In mythology 8 In psychology 9 In music 10 In television 11 In film 12 In literature 13 In video games 14 In sports 15 In other fields 15.1 Names and titles 16 Notes 17 See also 18 References 19 External links

[edit] In mathematics

• Seven is a Mersenne prime, since 2³ - 1 = 7.
• Seven is both a Carol number and a Kynea number.
• Seven is the 4th prime number.
• Seven is the first Newman-Shanks-Williams prime.
• Seven is the first Woodall prime.
• Seven is the fourth factorial prime
• Seven is the fourth Mersenne prime exponent.
• Seven is the fourth self number.
• Seven is the only number less than 15 which cannot be represented as the sum of the squares of three integers.
• Seven is the second lucky prime.
• Seven is the second safe prime.
• Seven is the smallest happy number, except for the trivial example of 1.
• Seven is the third Lucas prime.

• 7 is the first natural number for which the next statement does not hold: "Two nilpotents endomorphisms from with the same minimal polynomial and the same rank are similar."
• 7 is the only dimension, besides the familiar 3, in which a vector cross product can be defined
• 999,999 divided by 7 is exactly 142,857. Therefore, when a vulgar fraction with 7 in the denominator is converted to a decimal expansion, the result has the same six-digit repeating sequence after the decimal point, but the sequence can start with any of those six digits. For example, 1/7 = 0.142 857 142.... and 2/7 = 0.285 714 285...

• A group or a series of seven is a heptad.
• A seven-sided shape is a heptagon. The regular n-gons for n ≤ 6 can be constructed by compass and straightedge alone, but the regular heptagon cannot. Figurate numbers representing heptagons (including seven) are called heptagonal numbers. Seven is also a centered hexagonal number.
• There are seven frieze groups, the groups consisting of symmetries of the plane whose group of translations is isomorphic to the group of integers.

[edit] In numeral systems

Base	Numeral system
2	binary	111
3	ternary	21
4	quaternary	13
5	quinary	12
6	senary	11
7	septenary	10
over 7 (octal, decimal, etc)		7

In quaternary, 7 is the smallest prime with a composite sum of digits.

In the English language, 7 is the only 2-syllable natural, positive 1-digit number

[edit] List of basic calculations

Multiplication	1	2	3	4	5	6	7	8	9	10		11	12	13	14	15	16	17	18	19	20		21	22	23	24	25		50	100	1000
	7	14	21	28	35	42	49	56	63	70		77	84	91	98	105	112	119	126	133	140		147	154	161	168	175		350	700	7000

Division	1	2	3	4	5	6	7	8	9	10
	11	12	13	14	15
	7	3.5		1.75	1.4		1	0.875		0.7
				0.5
							1
				2

Exponentiation	1	2	3	4	5	6	7	8	9	10		11	12	13
	7	49	343	2401	16807	117649	823543	5764801	40353607	282475249		1977326743	13841287201	96889010407
	1	128	2187	16384	78125	279936	823543	2097152	4782969	10000000		19487171	35831808	62748517

Radix	1	5	10	15	20	25	30	40	50	60	70	80	90	100
	110	120	130	140	150	200	250	500	1000	10000	100000	1000000
	1	5

[edit] Evolution of the glyph

In the beginning, various Hindus wrote 7 more or less in one stroke as a curve that looks like an uppercase J upside down. The western Ghubar Arabs' main contribution was to make the longer line diagonal rather than straight, though they showed some tendencies to making the character more rectilinear. The eastern Arabs developed the character from a 6-look-alike into an uppercase V-look-alike. Both modern Arab forms influenced the European form, a two-stroke character consisting of a horizontal upper line joined at its right to a line going down to the bottom left corner, a line that is slightly curved in some font variants. As is the case with the European glyph, the Cham and Khmer glyph for 7 also evolved to look like their glyph for 1, though in a different way, so they were also concerned with making their 7 more different. For the Khmer this often involved adding a horizontal line above the glyph.^[1] This is analogous to the horizontal stroke through the middle that is sometimes used in handwriting in the Western world but which is almost never used in computer fonts. This horizontal stroke is, however, important to distinguish the glyph for seven from the glyph for one in writings that use a long upstroke in the glyph for one.

On the seven-segment displays of pocket calculators and digital watches, 7 is the number with the most common glyph variation (0, 6 and 9 also have variant glyphs). Most calculators use three line segments, but on Sharp, Casio, and a few other brands of calculators, 7 is written with four line segments. The reason is that in Japan & Korea 7 is written as ① in the illustration to the right.

While the shape of the 7 character has an ascender in most modern typefaces, in typefaces with text figures the character usually has a descender, as, for example, in .

Some people, especially in Europe and Latin America, write 7 with a line in the middle and make the top line crooked. The line through the middle is useful to clearly differentiate the character from the number one, as these can appear similar when written in certain styles of handwriting.

[edit] In science

• Roy G. Biv = red, orange, yellow, green, blue, indigo, and violet were originally named as the seven colors of the rainbow, though blue and indigo are considered by some to be the same color.
• The number of spots on a common ladybug.
• The seven days of the week.
• With very few exceptions, all mammals' necks have seven bones.

[edit] Physics

• Arranging particles by charge from negative to positive and interpreting their charges as integer multiples of an elementary charge e* ( 1/3 e ) one gets the following seven charges realized in nature:

3. generation	τ-	anti-t	b-quark		anti-b	t-quark	τ+
2. generation	μ-	anti-c	s-quark		anti-s	c-quark	μ+
1. generation	e-	anti-u	d-quark		anti-d	u-quark	e+
0. generation				stem particle
charge	-3/3	-2/3	-1/3	0	+1/3	+2/3	+3/3
angular spin	-3	-2	-1	0	+1	+2	+3

It is obvious that a symmetry exists with no electromagnetic charge. It is assumed here, that the size of charge is linearly dependent on the number of quanta of angular spin generating it. In the state of symmetry no magnetic component is generated because no angular spin exists. A particle in such a supersymmetric state would be dark because it cannot electromagnetically interact. Breaking of supersymmetry of this topologically substructured superstring particle would be a change of its angular spin, generating corresponding particles of physics in dependence of the energy level. This angular spin not only generates charge but highly non-linearly also gravo-magnetic mass in dependence of string tension (energy). There seems to be only one generic unique geometry with a fixed functionality of a weak interacting superstring dark stem particle.(0. generation).

In generations one to three there are two sets of three physical particles with opposite charge according to the direction of angular spin. For all three generations only two geometrically and functionally identical dark stem particles exist. These only differ by their handedness, generating matter and antimatter particles on breaking of 0-spin symmetry.

The occurrence of matter and antimatter particles is asymmetric with respect to this symmetry, -3 -1 +2 for matter and -2 +1 +3 for antimatter. Both sets of three particles are arranged in a complementary way around the symmetry enabled by this global physical realization of the number seven. Thus the number seven only emerges as a complementary superposition of two sets of physical particles that are generated by breaking of a supersymmetric state. Nature only makes use of the symmetry provided by the number seven. It however does not actually realize it. Seven seems to be more 'constructed' by arranging two sets of entities representing the number three around a state of symmetry.

[edit] Chemistry

• A neutral pH value between acidity and alkalinity.
• The atomic number of nitrogen.
• The number of carbon atoms in heptane, a hydrocarbon.
• The number of periods, or horizontal rows of elements, on the periodic table.

[edit] Astronomy

• The number of stellar objects in the solar system visible to the naked eye — the Sun, the Moon and the five classical naked eye planets: Mars, Mercury, Jupiter, Venus, and Saturn.
• Messier object M7, a magnitude 3.5 open cluster in the constellation Scorpius.
• The New General Catalogue object NGC 7, a 14th magnitude spiral galaxy in the constellation Sculptor.
• The number of daughters of Atlas in the Pleiades (also called the "seven sisters").
• The number of saints appearing in a constellation called "Saptharishi Mandalam" in Indian astronomy.
• The number of stars in the constellation of The Big Dipper.
• The Saros number of the solar eclipse series which began on -2590 April 8 and ended on -1310 May 16. The duration of Saros series 7 was 1,280.1 years, and it contained 72 solar eclipses.
• The Saros number of the lunar eclipse series which began on -2595 July 15 and ended on -1008 February 22. The duration of Saros series 7 was 1,586.6 years, and it contained 89 lunar eclipses.
• The Roman numeral VII stands for white dwarfs in the Yerkes spectral classification scheme.
• The Roman numeral VII (usually) stands for the seventh-discovered satellite of a planet or minor planet (e.g., Jupiter VII).

[edit] In technology

• The code for international direct dial phone calls to Russia and Kazakhstan.
• The resin identification code used in recycling to identify "other" plastics such as polycarbonate
• The number of digits in an American or Canadian telephone number, excluding the area code.
• In Microsoft's Rich Text Format specification, seven and all numbers congruent to it modulo 256 refer to variants of the German language.
• Windows 7, the upcoming Microsoft operating system sometimes referred to as just "7".
• In the ASCII character set, the bell character.
• There are Seven Tools of Quality.

• There are seven layers in the OSI model.
• There are seven logic gates. NOT, AND, OR, NAND, XOR, NOR, XNOR
• The seven-segment display, is an electronic device that uses seven individual segments to create one digit; it is used in display devices like digital clocks and some basic calculator screens, amongst others.

[edit] In the classical world

In classical antiquity:

• Seven against Thebes
• Seven Emperors (and period; Rome, history)
  • Julius Caesar, Augustus, Galba, Hadrian, Nerva, Sallust, Vespasian
• Seven hills of Rome
• Seven Liberal Arts
• Seven Sages
• Seven Wonders of the ancient world

[edit] In religion

• In Judaism:
  • A highly symbolic number in the Torah, alluding to the infusion of spirituality and Godliness into the Creation. For example:
    1. God rested on and sanctified the seventh day (Shabbat).
    2. A seven-day purification period is required for one who has become tamei to become tahor.
    3. The Shmita (Sabbatical) year arrives every seventh year.
    4. The Jubilee (Yovel) year comes after 7 times 7 years.
    5. The Counting of the Omer leading up to the Giving of the Torah is expressed as "7 times 7 weeks."
    6. There are 7 days of Passover and Sukkot when celebrated in Israel.
    7. Shiv`a (another pronunciation of the Hebrew word for 7 -- (Hebrew: שבעה ; "seven")), is the number of days of mourning. Hence, one sits Shiva. As in Shiva (Judaism)
  • The weekly Torah portion is divided into seven aliyahs, and seven men or boys over the age of 13 are called up for the reading of these aliyahs during Shabbat morning services.
  • Seven blessings are recited under the chuppah during a Jewish wedding ceremony.
  • A Jewish bride and groom are feted with seven days of festive meals after their wedding, known as Sheva Berachot ("Seven Blessings").
  • The number of Ushpizzin (also known as the "Seven Shepherds") who visit the sukkah during the holiday of Sukkot: Abraham, Isaac, Jacob, Joseph, Moses, Aaron, and David.
  • The number of nations God told the Israelites they would displace when they entered the land of Israel (Deut. 7:1): the Hittite, the Girgashite, the Amorite, the Canaanite, the Perizzite, the Hivite, and the Jebusite.
  • In Breslov tradition, the seven orifices of the face (2 eyes, 2 nostrils, 2 ears, and the mouth) are called "The Seven Candles."
  • The menorah (Hebrew: מנורה), is a seven branched candelabrum lit by olive oil in the Tabernacle and the Temple in Jerusalem. The menorah is one of the oldest symbols of the Jewish people. It is said to symbolize the burning bush as seen by Moses on Mount Sinai (Exodus 25).
  • The number of times Cain will be avenged by God if he is murdered (Gen 4:15).
  • The Israelites circled Jericho for 7 days and then the wall tumbled down.
  • Yahweh or Jehovah is the divine name, whose letters' placed alphabetically equal 70, a product of the divine number 7.

• In Christianity:
  • The Seven Sacraments in the Christian faith (though some traditions assign a different number).
  • The Seven churches of Asia to which the "Book of Revelation" is addressed.
  • The Seven Joys of the Virgin Mary, of Roman Catholic, Anglican, and other traditions.
  • The Seven Sorrows of the Virgin Mary, of Roman Catholic, Anglican, and other traditions.
  • The Seven Corporal Acts of Mercy of Roman Catholic, Anglican, and other traditions.
  • The Seven Spiritual Acts of Mercy of Roman Catholic, Anglican, and other traditions.
  • The Seven last words (or seven last sayings) of Jesus on the cross.
  • The Seven Virtues: chastity, temperance, charity, diligence, kindness, patience, and humility
  • The Seven deadly sins: lust, gluttony, greed, sloth, wrath, envy, and pride.
  • The seven terraces of Mount Purgatory (one per deadly sin).
  • In the genealogy in the Gospel of Luke, Jesus is 77th in a direct line.
  • The number of heads of the three beasts (7*10*7+7*10*10+7*10=1260) of the Book of Revelation, and of some other monsters, like the hydra and the number of seals.
  • In the New Testament, the Gospel of Matthew 18:21, Jesus says to Peter to forgive seventy times seven times.^[2]
  • There are seven suicides mentioned in the Bible (OT and NT) ^[3]

• In Islam:
  • The number of ayat in surat al-Fatiha.
  • The number of heavens in Islamic tradition.
  • The number of Earths in Islamic tradition.
  • The number of circumambulations (Tawaf) that are made around the Kaaba
  • The number of walks {Al-Safa and Al-Marwah) that is travelling back and forth seven times during the ritual pilgrimages of Hajj and Umrah.
  • The number of fires in hell. i.e the 7 fires of hell.
  • The number of doors to heaven and hell is also seven.
  • The total number of Prophets sent by God are 124000. The sum of 1+2+4=7.
  • The number of followers to fight along side Jesus Christ and Imam Mehdi against the anti-Christ/dajjal is 313. the sum 0f 3+1+3=7.
  • The number 786 which in Islam is also used to denote "in the Name of Allah" sums 7+8+6=21 divisible by 7.

• Others:
  • The number of Archangels according to some systems.
  • The minor symbol number of yang from the Taoist yin-yang.
  • The number of palms in an Egyptian Sacred Cubit.
  • The number of ranks in Mithraism.
  • The number seven is of particular significance within Cherokee cosmology.
  • In Buddhism, Buddha walked 7 steps at his birth.

• In Hinduism:
  • The Sanskrit word 'sapta' refers to number seven.
  • The Indian Music has 'sapta swaras', means seven octats (sa re ga ma pa dha ni), which are basics of music, using which hundreds of Ragas are composed.
  • Celestial group of seven stars are named as 'Sapta Rishi' based on the seven great saints.
  • Seven Promises, Seven Rounds in Hindu Wedding and Seven Reincarnation
  • As per Hindu mythology, there are seven worlds in the universe, seven seas in the world and seven Rishies (seven gurus) called sapta rishis.
  • seven hills at tirumala also known as ezhu malaiyan means Sevenhills god

• In the Bahá'í Faith:
  • The mystical text "The Seven Valleys", by the Prophet-Founder Bahá'u'lláh, details the journey of the soul through the seven "valleys" of Search, Love, Knowledge, Unity, Wonderment, Contentment, and finally True Poverty and Absolute Nothingness.

[edit] In mythology

• In Khasi mythology, the seven divine women who were left behind on earth and became the ancestresses of all humankind.
• The number of gateways traversed by Inanna during her descent into the underworld.
• The number of sleeping men in the Christian myth of the "Seven Sleepers."
• The Seven Sages in Sumerian mythology and various other mythologies.
• The number of sages in Hindu mythology; their wives are the goddesses referred to as the "Seven Mothers."
• The number of main islands of mythological Atlantis.
• In Guaraní mythology, the number of prominent legendary monsters.
• Seven Lucky Gods exist in Japanese mythology.
• In Irish Mythology, the epic hero Cúchulainn is associated with the number 7. He has 7 fingers on each hand, 7 toes on each foot, and 7 pupils in each eye. In the Irish epic Táin Bó Cúailnge, Cúchulainn is 7 years old when he receives his first weapons and defeats the armies of the Ulaidh. and his son Connla is 7 years old when he is slain by Cúchulainn in "The Death of Aife's Only Son".
• In British Folk lore, every 7 years the Fairy Queen pays a tithe to Hell (or possibly Hel) in the tale of Tam Lin.
• In the British Folk tale of Thomas the Rhymer, he went to live in the faerie kingdom for 7 years.

[edit] In psychology

• The Magical Number Seven, Plus or Minus Two is a 1956 paper by cognitive psychologist George A. Miller, who found a correlation between various human cognitive capacity limits within the range 7±2.

[edit] In music

• 1. 7, the pseudonym of American musician Mick Thomson, when performing with Slipknot
• A famous dance group from Kercova(Macedonia)- Sevens group
• The number of notes in the traditional Western Major Scale
• The original diameter in inches of the 45rpm format gramophone record.
• In music, the Roman numeral vii is the leading tone (vii°) or subtonic (VII) scale degree, chord, or diatonic function, when distinguished V = major and v = minor.
• The number of completed, numbered symphonies of Jean Sibelius and Sergei Prokofiev.
• A pop music singer in South Korea: SE7EN (singer).
• There are seven musicians in a septet or a septuor.
• The stage name of musician Keith Volpone.
• The name of Jurassic 5 member Mark 7even.
• 7 is an album by Apoptygma Berzerk.
• 7 is a song by Prince from his album Love Symbol released in 1992.
• 7 Shades of Black is a song on the Smashing Pumpkins album Zeitgeist, which made its release in 2007.
• A 2003 Atmosphere album is titled Seven's Travels, after an early alias of the group's MC, Slug
• Love Is the Seventh Wave by Sting on his first solo album, Dream of the Blue Turtles.
• Iron Maiden's second #1 album was entitled Seventh son of a Seventh son
• Former Bone Thugs N Harmony member Bizzy Bone's record label is named 7th Sign Records, also called the 7th Sign Regime
• The albums: Keeper of the Seven Keys Part 1, Keeper of the Seven Keys Part 2 and Keeper of the Seven Keys - The Legacy, by Helloween.
• The song: The Bells of the 7 Hells, by Helloween on the Album Gambling With the Devil.
• The songs: Seven and Seven Days of the Week (I Never Go to Work), by They Might Be Giants on the Album Here Come the 123s.
• The name of the first album by British indie rock and roll band Moral Soul
• The song Seventy Times Seven by Brand New.

[edit] In television

• The name of one of the monsters in the cartoon television show Seven Little Monsters.
• Seven, an episodic character from the sitcom Married... with Children.
• In Star Trek: Voyager, Seven of Nine (also called Seven for short) is one of the crewmembers.
• In an episode of Seinfeld entitled "The Seven", the name George Costanza desired to give his first-born (with Susan Ross) is "Seven;" he later falsely claimed that he had promised this to the widow of baseball great Mickey Mantle, whose uniform number was 7.
• The name of a television show 7th Heaven.
• Seven Network, a television network in Australia.
• Maximum number of VHF broadcast channels available in any TV market in the United States of America; they are channels 2, 4, 5, 7, 9, 11, and 13 in the Greater New York City and Los Angeles-Long Beach SMSAs.
• In Stargate SG-1 and Stargate Atlantis, most gate addresses use 7 chevrons on the gate.
• Ultra Seven, a television series aired in 1967, and the superhero of the same name. He is the honorary seventh member of the Ultra Garrison.
• The name of a memorable The Adventures of Super Mario Bros. 3 cartoon, 7 Continents for 7 Koopas.
• In the anime series Fate/Stay Night and the Visual Novel of the same name, there are seven classes of servants: Saber, Archer, Lancer, Berserker, Rider, Assassin, and Caster.
• Blake's Seven was a BBC Science Fiction series that ran from 1978 to 1981, often without Blake, or seven members of the crew.
• In an episode of Friends, titled "The One With Phoebe's Uterus," when Chandler seeks advice from Monica and Rachel about how to get a girl to "agree" with him more(innuendo referring to how when his girlfriend dated Joey, during sex, Chandler constantly heard her yelling, "Yes!" etc.), Monica draws a woman and labels seven spots on the body that would increase her pleasure. Monica then says a combination that would work very well, ending with her saying, "4. 2. 2...4-7. 5-7. 6-7! 7!" repeating "7!" eight more times, sighing, fall back into the couch, then holding up a full hand and two fingers, silently mouthing the word, "seven..."
• In an episode of Futurama (Luck of the Fryrish) Fry finds a seven-leaf clover, which allows him to do unbeilievable feats and have, of course, insane luck.
• On the reimagined 'Battlestar Galactica', Cylon 7 is the last of the Cylons to be revealed.

[edit] In film

• The musical film Seven Brides for Seven Brothers.
• The Marilyn Monroe film The Seven Year Itch which is famous for the white dress blowing up.
• The movie Se7en, directed in 1995 by David Fincher and starring Brad Pitt and Morgan Freeman.
• The movie The Seventh Sign, directed in 1988 by Carl Schultz and starring Jürgen Prochnow and Demi Moore.
• James Bond's agent secret number is 007.
• In the Disney film Snow White and the Seven Dwarfs.
• The film Lucky number s7evin, directed in 2006 by Paul McGuigan.
• The film The Magnificent Seven starring Yul Brynner.
• The Japanese film Seven Samurai directed by Akira Kurosawa.
• The Swedish film The Seventh Seal directed by Ingmar Bergman.
• In 2001: A Space Odyssey (film), Dave Bowman encounters seven octahedra during his journey through the infinite.
• The film Seven Sinners 1940 directed by Tay Garnett, starring Marlene Dietrich
• The film Seven Years in Tibet (1997) directed by Jean-Jacques Annaud
• Seven triquels competed for box office revenue in Summer 2007: Spider-Man 3, Shrek the Third, Pirates of the Caribbean: At World's End, Ocean's Thirteen, Rush Hour 3, Resident Evil: Extinction, and The Bourne Ultimatum. The last of these, which set a record for the best August opening weekend ever, was the only one to out-gross its predecessors^[4].

[edit] In literature

• In The Lost Years of Merlin Trilogy, a book is titled "The Seven Songs of Merlin"
• In the Harry Potter series of novels by J. K. Rowling, seven is said to be the most powerfully magical number. There are a number of references to seven in Harry Potter: There are a total of seven books in the series; Ginny Weasley is the seventh child and only daughter; Harry Potter was born in July, the seventh month of the year; Wizarding students must complete seven years of school at Hogwarts; Lord Voldemort splits his soul into seven parts which he believes ensures his immortality. Seven is also the number on the back of Harry Potter's Quidditch robes (Prisoner of Azkaban movie). In Quidditch each team consists of seven players. Chapter four of Book 7 is titled "The Seven Potters".
• In The Two Towers, the second volume of J. R. R. Tolkien's The Lord of the Rings, the following poem appears: "Tall ships and tall kings/Three times three/What brought they from the foundered land/Over the flowing sea?/Seven stars and seven stones/And one white tree." The "foundered land" is Númenor, and the "Seven Stars" are unknown, but they may refer to a constellation, the Sickle of the Valar. The Seven Stones are the palantíri, the seeing-stones. Also in The Lord of the Rings, the Dwarves were given seven rings.
• In The Silmarillion, also a Tolkien work, there are seven Lords of the Valar, and seven Ladies of the Valar; Fëanor, a central character, has seven sons: Maedhros, Maglor, Celegorm, Curufin, Caranthir, Amrod, and Amras.
• In Galician folklore, a seventh son will be a werewolf. In other folklores, after six daughters, the seventh child is to be a son and a werewolf. In other European folklores, the seventh son of a seventh son will be a child with special powers of healing and clairvoyant seeing.
• In Fist of the North Star (Hokuto no Ken), the main character, Kenshiro, is also known as "the man with seven wounds" for the seven scars on his body in the shape of the Big Dipper.
• Aleksis Kivi's "Seven Brothers", the most famous book of Finnish literature.
• Seven Pillars of Wisdom, a book written by T. E. Lawrence.
• The Secret Seven, name of a children's adventure book by Enid Blyton.
• The book Seven Years in Tibet.
• The anime Eureka Seven.
• The character 7 (Nana) and the organisation Septimal Moon in Loveless (manga).
• The Seven Habits of Highly Effective People, a book by Stephen Covey.
• Team 7 consists of the main characters in Naruto: Naruto Uzumaki, Sasuke Uchiha, Kakashi Hatake, and Sakura Haruno.
• In the One Piece series, the Shichibukai (literally, "Seven Military Seas", known in the English versions as the "Seven Warlords of the Sea") are seven powerful pirates who work for the government.
• In the Dragon Ball series, there are 7 Dragon Balls that can grant any wish.
• In the InuYasha series, the Shichinintai are, as their name says, a band of seven mercenaries.
• In the Nana series, there are many recurrent instances of the number seven ("nana" is the Japanese numeral for the English "seven"), including the name of both main characters.
• In George R. R. Martin's A Song of Ice and Fire, seven gods, the Mother, the Father, the Warrior, the Crone, the Smith, the Maiden, and the Stranger, are worshipped in the land of Westeros, which is made up of seven former kingdoms and often called the Seven Kingdoms. The Seven are the primary deities of Westeros.
• In The Dark Tower series by Stephen King there are 7 books.
• In The Wheel of Time series by Robert Jordan, there are 7 seals on the Dark One's prison.
• In Neil Gaiman's Sandman series, there are 7 Endless: Destiny, Death, Dream, Destruction, Despair, Desire and Delirium.
• The Saga of Seven Suns, a series of seven novels by Kevin J. Anderson.
• In George Orwell's Animal Farm, there are seven commandements, and the song " Beast of England" is sung seven times after the animals overthrow Mr. Jones.
• In W.E.B. Du Bois's book The Souls of Black Folk, he refers to “the Negro” as “the seventh son.”
• In Septimus Heap Book one Magyk. Septimus Is the seventh son of a seventh son, 7 is believed to be the most magykal number.
• In the first of the three Deltora Quest series of books by Emily Rodda, the protagonist must collect the seven gems of the fabled Belt of Deltora: topaz, ruby, opal, lapis lazuli, emerald, amethyst, and diamond. Each of the seven gems are guarded by one of seven guardians located in one of the seven locations around Deltora: The Forests of Silence, Lake of Tears, City of the Rats, The Shifting Sands, Dread Mountain, Maze of the Beast, and Valley of the Lost.
• A book is currently being written about 7 by Jacqueline Leo and Edward Burger

[edit] In video games

• 7 is a number used many times by Bungie Studios in their Halo series and Marathon trilogy. 7 appears in a variety of different contexts, from the stories of the games to the raw game coding. One obvious example is the fact that there are seven Halo rings strewn throughout the galaxy.
• Final Fantasy VII has many instances of seven throughout the game and was even released (in North America) on the seventh day of September ("September" originally meant "seventh month") in 1997.
• In the Sonic the Hedgehog games, Sonic collects seven Chaos Emeralds which allow him to turn into Super Sonic.
• The number of individual personalities serving Harman Smith as part of the group of assassins called the Killer7, hence the title of the game.
• In Kingdom Hearts there are seven Princesses of Heart (Snow White, Cinderella, Alice, Aurora, Belle, Jasmine, and Kairi (the only original character among them)). Seven (VII) is also the number of the character Saïx, a member of the antagonists Organisation XIII from Kingdom Hearts II.
• In the Super Mario RPG/Paper Mario series of games, the collection of seven mystical items (predominantly stars, but also hearts in Super Paper Mario) is the main quest of the game.
• In The Legend of Zelda: Ocarina of Time, the main quest involves awakening the seven sages of seven elements to banish evil from the land of Hyrule.
• The number of Koopalings on Super Mario Bros. 3 and Super Mario World. It is also the number of worlds on Super Mario World, not counting the Star World or the Special course; and it is also the number of worlds on Super Mario Bros. 2.
• The 7 is a group of deadly mercenaries that kidnap the protagonist's family in the video game Kane & Lynch: Dead Men.
• In Final Fantasy X, there are seven main characters, each with a coresponding stellar naked eye celestial object which are used to unlock their most powerful weapons.
• In the Ace Attorney Series, 7 is a recurring number. For example: There is a 7 year age gap between the main character and his assistant, there is a 7 year gap between the plots of Ace Attorney 3 and 4, the Chief of police, Gant's keycard number is 7777777.
• Nana (One of two Japanese readings for "seven" and also a common feminine name) is one of the supporting characters in Mega Man X: Command Mission.

[edit] In sports

• In Ultimate Frisbee, the number of players on the field for each team.
• In team handball, the number of players on each team including the goalkeeper.
• In rugby league, the scrum-half/halfback.
• In rugby union, the openside flanker.
• In American football, the number of players who, by rule, are lined up at the line of scrimmage.
• In scoring baseball, seven represents the left fielder's position.
• In baseball, the 7th Inning stretch attributed to the 27th US President, William Howard Taft.
• Retired jersey number of Hall of Fame baseball player Mickey Mantle
• The great baseball catcher Iván Rodríguez uses 7 as his jersey number
• In high-school baseball a regulation game lasts seven innings.
• Seven Cycles, a bicycle manufacturer
• In the NHL, MLB, and NBA, the maximum number of games played in a playoff series.
• Rugby Sevens, a variant of rugby union and rugby league that contains only seven players per side instead of the standard 15 (union) or 13 (league).
• The Rugby World Cup Sevens, the World Cup for the union version of Sevens.
• The IRB Sevens World Series, also in the union version of Sevens.
• Henrik Larsson, the football (soccer) legend wore number 7 at Celtic F.C.and is normally associated with the number while playing.

[edit] In other fields

• Seven is the number of external holes in the human head: two eyes, two nostrils, one mouth, two ears.
• Seven is the smallest positive integer whose name in English is more than one syllable long.
• The Kulin people of Australia living near the Dandenong Ranges traditionally have seven seasons. Some of the Native Americans of Montana also have seven seasons: chinook season, muddy spring, green summer, gold summer (or dry summer), 'Indian' Summer, late fall, and cold winter.
• The United States Constitution, as drafted in Philadelphia in 1787, was composed of 7 Articles.
• The United States declared Independence in the 7th month of 1776.

• In a standard deck of playing cards the 7 of Diamonds is the only diamond card that can be viewed as upside down when reversed.
• Lotto Super 7, a Canadian-lottery game

Seven is also:

• The traditional number of Wonders of the Ancient World. There were seven, though only the Great Pyramid of Egypt still stands today.
• The figurative number of seas.
• The number of chakras.
• The number of basic principles of the bushido.
• The number of points on a sheriff's star.
• When rolling two standard six-sided dice, seven is the number most likely to occur. It is the sum of any two opposite sides on a standard six-sided die
• The Heptarchy, from the (Greek for seven realm, is the name applied by historians to the period (500-850 CE) in English history after the Anglo-Saxon conquest of England, derived from the seven kingdoms of Northumbria, Mercia, East Anglia, Essex, Kent, Sussex, and Wessex, which eventually merged to become the Kingdom of England during the early 10th century.
• September was the seventh month in the ancient Roman calendar, as its name indicates. After the reform that led to the current order, the seventh month is July.
• Septidi was the seventh day of the decade in the French Revolutionary Calendar.
• The traditional count of Basque provinces as expressed in the slogan Zazpiak Bat.
• Cibola was one of the legendary Seven Cities of Gold the Spanish thought existed.
• In casinos, the line 7-7-7 (triple seven, not seven hundred seventy-seven) is a common winning line on slot machines.
• septuplets is seven babies
• The letter T in l33t

[edit] Names and titles

• Sevens, a card game.
• An agency of photojournalists founded by seven photographers.
• Canadian fashion photographer Sev Seven.
• California graffiti artist Seven
  • The Seven Virgins:
    • The Seven Virgins mountain range in Sri Lanka, which was the scene of an air disaster on December 4, 1974, involving a DC-8 Series 55F passenger jetliner operated by the charter company Martinair, which left 191 dead.
  • Seven of Nine, a crew member in the Star Trek universe.
• In the Fushigi Yuugi series, the four beast gods each have seven warriors, the Genbu Seven, the Byakko Seven, the Seiryuu Seven, and the Suzaku Seven.
• In the Catalan culture, seven is present in a lot of popular stories like "Les set cabretes i el llop".
• Number 7 is a popular brand of Canadian cigarettes.
• "The Seven", also written: "The Se7en" is an exclusive grouping of dental surgeons.
• 7UP is the name of a popular soft drink.
• 7-Eleven is the trading name of a chain of convenience stores based in the U.S.
• Seven Jeans, also known as Seven '7' for all Mankind, a brand of designer jeans.
• 7 (New York City Subway service), a service of the New York City Subway
• 7-ip is the name of an Australian satellite and wireless technology start up
• The Ultra Series has two heroes with "Seven" in their name: Ultra Seven and Ultra Seven-21.
• SEVEN Networks is a US company producing mobile email software.
• The circle 7 logo used by numerous ABC network O&O stations in the United States.
• In a survey in England seven was discovered to be the most common lucky number in the 2000 people that were surveyed.
• 7Seven is a company based in Cancun offer outsourcing revenue management for hotels.

[edit] Notes

[edit] See also

• Seven climes
• Septenary (numeral system)
• Septenary (Theosophy)
• Year Seven (School)

[edit] References

• Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group (1987): 70 - 71

[edit] External links

• Septimal time
• Seventy-seven things you need to know about 07