7

"Seven" redirects here. For other uses, see Seven (disambiguation).

7
Template:Numbers (digits)
Cardinal	7 seven
Ordinal	7th seventh
Numeral system	septenary
Factorization	prime
Divisors	1, 7
Roman numeral	VII
Roman numeral (Unicode)	Ⅶ, ⅶ
Amharic	፯
Arabic	٧
Persian	٧ - هفت
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.

In mathematics

• Seven is the fourth prime number. It is not only a Mersenne prime (since 2³ − 1 = 7) but also a double Mersenne prime since it is itself the exponent for another Mersenne prime (127). It is also a Newman-Shanks-Williams prime, a Woodall prime, a factorial prime, a lucky prime, a happy number, a safe prime and the fourth Heegner number.
• Seven is the lowest number which cannot be represented as the sum of the squares of three integers.
• Seven is the aliquot sum of one number, the cubic number 8 and is the base of the 7-aliquot tree.

It is also said to be a lucky number.

• n = 7 is the first natural number for which the next statement does not hold: "Two nilpotent endomorphisms from Cⁿ 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 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.
• There are seven fundamental types of catastrophes.
• Seven is the sum of any two opposite sides on a standard six-sided die. When rolling two standard six-sided dice, seven has a 6 in 36 (or 1/6th) probability of being rolled (1–6, 6–1, 2–5, 5–2, 3–4, or 4–3), the greatest of any number.
• The Millennium Prize Problems are seven problems in mathematics that were stated by the Clay Mathematics Institute in 2000. Currently, six of the problems remain unsolved.

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.

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 × x	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 ÷ x	7	3.5	2.3	1.75	1.4	1.16	1	0.875	0.7	0.7
	0.63	0.583	0.538461	0.5	0.46
x ÷ 7	0.142857	0.285714	0.428571	0.571428	0.714285	0.857142	1	1.142857	1.285714	1.428571
	1.571428	1.714285	1.857142	2	2.142857

Exponentiation	1	2	3	4	5	6	7	8	9	10		11	12	13
7x	7	49	343	2401	16807	117649	823543	5764801	40353607	282475249		1977326743	13841287201	96889010407
x7	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
x7	1	5	137	217	267	347	427	557	1017	1147	1307	1437	1567	2027
	2157	2317	2447	2607	3037	4047	5057	13137	26267	411047	5643557	113333117

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 vertically inverted. 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. 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 because, in Japan and 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, Latin America, and New England, write 7 with a line in the middle ("7"), sometimes with 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. This glyph is used in official handwriting rules for primary school in Russia.

In science

Physics

The 7 colours of the rainbow

• There are 7 SI base units. These are a coherent set of units defined to measure 7 basic physical properties: metre, kilogram, second, ampere, kelvin, mole, candela. The 7 SI base units are used to define all other SI units, which are known as SI derived units.
• Isaac Newton identified 7 colours of the rainbow - red, orange, yellow, green, blue, indigo, and violet

Chemistry

Heptane is an alkane with 7 carbon atoms per molecule

• an heptamer is a compound made of seven sub-units
• A neutral pH value between acidity and alkalinity
• The atomic number of nitrogen
• Heptane is an alkane with 7 carbon atoms in each molecule
• A period 7 element has 7 electron shells

• The number of periods, or horizontal rows of elements, in the periodic table

Biology

• Almost all mammals have 7 cervical vertebrae
• There are 7 types of virus according to the Baltimore classification
• The number of spots on a seven-spot ladybird

Astronomy

• The number of daughters of Atlas in the Pleiades (also called the "Seven Sisters")
• The number of stellar objects in the solar system visible to the naked eye from Earth— 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 saints appearing in a constellation called "Saptharishi Mandalam" in Indian astronomy.
• The number of stars in the constellations of the Big Dipper and Orion.
• 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).

Psychology

• The Magical Number Seven, Plus or Minus Two

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

In religion

Christianity

Seven Days of Creation - 1765 book

The number seven (7) in the seven days of Creation is typological and the number seven appears commonly elsewhere in the Bible. These include:

• Seven days of Creation (Genesis 1). God rested on and sanctified the seventh day (Sabbath)
• Seven years of plenty and seven years of famine in Pharaoh's dream (Genesis 41)
• Seven days of the feast of Passover (Exodus 13:3-10)
• Seven day week and the pattern concerning distribution and use of manna (Exodus 16)
• Seven year cycle around the years of Jubilee (Leviticus 25)
• The fall of the walls of Jericho on the seventh day after marching around the city seven times(Joshua 6)
• Seven things the LORD hates (Proverbs 6:16-19)
• Seven loaves multiplied into seven baskets of surplus (Matthew 15:32-37)
• The Seven last words (or seven last sayings) of Jesus on the cross.
• Seven men of honest report, full of the Holy Ghost and wisdom (Acts 6:3)
• Seven Spirits of God are mentioned in the Book of Revelation.
• Seven churches of Asia to which the "Book of Revelation" is addressed.
• Seven churches, seven stars, seven seals, seven last plagues, seven vials or bowls, seven thunders in the Revelation, the last book of the Bible.

Other sevens in Christian knowledge and practice include:

• The Seven Sacraments in the Catholic faith (though some traditions assign a different number).
• Seven Gifts of the Holy Spirit
• 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 and Seven Spiritual Acts of Mercy of Roman Catholic, Anglican, and other traditions.
• 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.
• There are seven suicides mentioned in the Bible (OT and NT)

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
• There are 7 Chakras.

Islam

• The number of ayat in surat al-Fatiha.
• The number of heavens in Islamic tradition.
• The number of levels of Earth in Islamic tradition.
• The number of circumambulations (Tawaf) that are made around the Kaaba
• The number of walks between Al-Safa and Al-Marwah mountains -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 hell is also seven.
• In Verse 12:46 (see Islamic view of Joseph) of the Quran, Joseph (Yusef) is asked to interpret the King's dream where seven fat cows were dreamt to have been devoured by seven skinny cows and seven green spikes, and others shrivelled.
• It is widely accepted that Surah Al Kahf (Surah 18, verse 9-26) narrates the story of Seven Sleepers who travelled in time by sleeping in a cave for three hundred solar years and nine lunar years, which is similar to the christian myth of the same name.

Judaism

The Menorah is a 7-branched candelabrum

• A highly symbolic number in the Torah, alluding to the infusion of spirituality and Godliness into the creation. For example:
  • God rested on and sanctified the seventh day (Shabbat). – Genesis 2:3. "Wisdom has built her house, she has hewn out her seven pillars." – Proverbs of Solomon son of David King of Israel 9:1
  • A seven-day purification period is required for one who has become tamei to become tahor.
  • The Shmita (Sabbatical) year arrives every seventh year.
  • The Jubilee (Yovel) year comes after 7 times 7 years.
  • The Counting of the Omer leading up to the Giving of the Torah is expressed as "7 times 7 weeks."
  • There are 7 days of Passover and Sukkot when celebrated in Israel.
  • 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 Jewish men (or boys over the age of 13 who are considered men; Bar Mitzvah) 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.

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 Bahá'í, the mystical text The Seven Valleys, by the Prophet-Founder Bahá'u'lláh, relates the journey of the soul through the seven "valleys" of Search, Love, Knowledge, Unity, Contentment, Wonderment, and finally True Poverty and Absolute Nothingness.
• In Buddhism, Buddha walked 7 steps at his birth.
• Circle Seven Koran, the holy scripture of the Moorish Science Temple of America
• In Spanish and other Romance Languages, cats are said to have 7 lives as opposed to English, where cats are said to have 9 lives.
• In Iran cats are also said to have 7 lives.
• In Wiccan spirituality the number seven is said to hold a lot of divinity. It is known for being a very sound number and associates with many things.

The Seven Lucky Gods in Japanese mythology

• The Seven Lucky Gods refer to the seven gods of good fortune in Japanese 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.
• 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.
• The 7th glyph of the Mayan Calendar is Blue Hand, it represents the days in creation and is associated with creative perfection. This is the glyph of the last day of their calendar that ends on December 21, 2012.
• The seven branched sword in Korean mythology.

In music

• #7 is the pseudonym of American musician Mick Thomson, when performing with Slipknot
• Tupac's 7 day theory
• 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.
• There are seven musicians in a septet or a septuor.
• Seven is the seventh song off of the Technical Death Metal band Necrophagist Epitaph album.

In television

• In Star Trek: Voyager, Seven of Nine (also called Seven for short) is one of the crewmembers
• Blake's Seven was a BBC science fiction series that ran from 1978 to 1981
• 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 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.
• Seven Network, a television network in Australia.
• ProSieben (sieben being German for seven), a television network in Germany
• 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.
• 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 The Adventures of Super Mario Bros. 3 cartoon, 7 Continents for 7 Koopas.
• The name of a television show 7th Heaven
• Eureka Seven, a science fiction and romance anime.
• Seven Days, a science fiction show about the NSA using time travel.

In film

• The 1954 Seven Samurai by Akira Kurosawa starring Toshiro Mifune
• The 1960 American western film The Magnificent Seven starring Yul Brynner
• 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
• In the Disney film Snow White and the Seven Dwarfs
• The film Lucky Number Slevin, directed in 2006 by Paul McGuigan starring Josh Hartnett and Morgan Freeman
• The Swedish film The Seventh Seal directed by Ingmar Bergman
• James Bond's secret agent number is 007
• The 1940 film Seven Sinners directed by Tay Garnett, starring Marlene Dietrich
• The 1997 film Seven Years in Tibet directed by Jean-Jacques Annaud
• The 2008 film Seven Pounds starring Will Smith
• The 1925 film Seven Chances starring Buster Keaton
• The Anime Elfen Lied includes a character called Nana (Japanese for 7)

In literature

• In The Lost Years of Merlin series, 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 of the Weasley family; 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. The number seven was also significant to Dwarvish culture as portrayed by Tolkien: there were seven fathers of the Dwarves (as recounted in The Silmarillion) and the Dwarves were later given seven rings by Sauron (according to The Lord of the 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, and in other cultures that seventh son of a seventh son would be a vampire.
• 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 manga Eureka Seven, based on the anime series.
• The character 7 (Nana) and the organisation Septimal Moon in Loveless (manga).
• The Seven Habits of Highly Effective People, a book by Stephen Covey.
• Seven: The Number for Happiness, Love, and Success, a book by Jacqueline Leo
• Team 7 consists of the main characters in Naruto: Naruto Uzumaki, Sasuke Uchiha, Kakashi Hatake, and Sakura Haruno. Later in the series, Sai joined team 7 after Sasuke left Konohagakure.
• 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 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 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 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.
• The Seven Rings of the Vongola Family in Katekyo Hitman Reborn: Sky, Storm, Rain, Sun, Thunder, Mist, and Cloud.
• 'The Seven Dials Mystery' by Agatha Christie
• In 'The Tales of Alvin Maker', an alternate history fantasy series by Orson Scott Card, seventh sons are imbued with special powers, referred to as "knacks", over the physical world. The powers of a seventh son of a seventh son, the birthright of the series' main character, Alvin Smith, are especially pronounced. Men who wield these powers to create are referred to as "Makers."
• '“7: The Magical, Amazing and Popular Number Seven”.' A seven book by David Eastis devoted to the popular and lucky number 7.

In video games

The 7 Chaos Emeralds in Sonic R

• In Sega's Sonic the Hedgehog video game franchise, there are often seven Chaos Emeralds
• 7 is a number used many times by Ensemble Studios and 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.
• 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 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. Further, the number of years separating the child and adult stages of the game is seven.
• Another Zelda title, The Legend of Zelda: A Link to the Past, involves a similar quest in which the player must rescue seven maidens before confronting Ganon.
• 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 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.
• In Super Mario RPG: Legend of the Seven Stars, Mario and his gang need to collect seven stars to repair the Star Road.
• In The World Ends with You, one of the antagonists is a musician called "777".
• In Final Fantasy VII If anyone in your party's HP reaches to 7777, they will go berserk and strike the opponent a number of times at a damage rate of 7777. This is called the Lucky 7's. After the battle, however, the character's HP will be reduced to 1 to prevent this state from rolling over to another battle.
• In Valkyria Chronicles, you control Squad 7 of the militia force.

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, must be lined up at the line of scrimmage on offense (otherwise the team commits the penalty of illegal formation).
• 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
• Retired jersey number of Hall of Fame hockey player Phil Esposito
• Retired jersey number of Hall of Fame football player John Elway
• In high-school baseball a regulation game lasts seven innings.
• 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.
• In association football the forward or winger tradiationally wears the number 7.
• In cross country running, a team traditionally consists of seven athletes.

In other fields

International maritime signal flag for 7

• The seven days of the week
• 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 declared Independence in the 7th month of 1776.
• Lotto Super 7, a Canadian-lottery game that will have its final drawing September 18, 2009

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 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.
• Septuplets are seven offspring resulting from the same pregnancy.
• The British fifty pence coin has 7 sides

Names and titles

• Sevens, a card game.
• 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.
• 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.
• 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
• The Ultra Series has two heroes with "Seven" in their name: Ultra Seven and Ultra Seven-21.
• The circle 7 logo used by numerous ABC network O&O stations in the United States.
• The Lotus Seven, a kit car produced by Lotus

See also

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

References

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

External links

• Seventy-seven things you need to know about 07