23 (number)

${\displaystyle \mathbb {C} _{0}}$. The Leech lattice can be constructed in various ways, which include:

• By means of a matrix of the form ${\displaystyle \scriptstyle {\begin{pmatrix}Ia&H/2\\H/2&Ib\end{pmatrix}}}$ where ${\displaystyle I}$ is the identity matrix and ${\displaystyle H}$ is a 24 by 24
  mod
  23 for nonzero n.

• Through the
  extended binary Golay code
  ${\displaystyle \mathbb {B} _{24}}$ and Witt design ${\displaystyle \mathbb {W} _{24}}$, which produce a construction of the 196,560 minimal
  perfect binary Golay code
  ${\displaystyle \mathbb {B} _{23}}$, which has codewords of size 23. ${\displaystyle \mathbb {B} _{23}}$ has Mathieu group ${\displaystyle \mathbb {M} _{23}}$ as its
  sporadic groups
  . ${\displaystyle \mathbb {M} _{23}}$ has a minimum faithful complex representation in 22 dimensions and group-3 actions on 253 objects, with 253 equal to the number of pairs of objects in a set of 23 objects. In turn, ${\displaystyle \mathbb {M} _{23}}$ is the automorphism group of Mathieu group ${\displaystyle \mathbb {M} _{24}}$, which works through ${\displaystyle \mathbb {W} _{24}}$ to generate 8-element octads whose individual elements occur 253 times through its entire block design.

• Using Niemer lattice D₂₄ of
  Coxeter number 46 = 2·23, it can be made into a module over the ring of integers of quadratic field
  ${\displaystyle \mathbb {Q} ({\sqrt {-23}})}$, whereby multiplying D₂₄ by a non-principal ideal of the ring of integers yields the Leech lattice.

${\displaystyle {\tilde {B}}_{4}}$ cubic group

${\displaystyle \mathrm {D} _{5}}$ demihypercubic group

In

• The atomic number of vanadium.
• The
  stable isotope of sodium
  .
• Normal human
  sex cells have 23 chromosomes.^[40] Other human cells have 46 chromosomes, arranged in 23 pairs.^[41]
• Scientific notation for the Avogadro constant is written as 6.02214076×10²³.^[42]
• 23 is the width of the Arecibo message, sent to space in search for extraterrestrial intelligence.
• 23 is the
  TCP/IP port used for telnet and is the default for the telnet command.^[43]
• The Earth's axis is tilted at approximately 23°.

In religion

• In Biblical numerology, it is associated with Psalm 23, also known as the Shepherd Psalm. It is possibly the most quoted and best known Psalm.^[44][45] Psalms is also the 23rd book in the Douay–Rheims Bible.
• In Islam, the
  Qur'an was revealed in a total of 23 years to Muhammed.^[46][47]
• Muslims believe the first verses of the Qur'an were revealed to the Islamic prophet Muhammad on the 23rd night of the 9th Islamic month, though, its disputed. [48]
• In I Ching divination, Hexagram 23 is 剝 (bō), "peeling" or "splitting apart".
• 5) is one of the sacred numbers of Eris
  , goddess of discord.

• Alfred Harth
  uses the number 23 in his artist name Alfred 23 Harth, or A23H, since the year 1+9+8+5 = 23.
• Twentythree is the name of Tristan Prettyman's debut album
• Twentythree an album by Carbon Based Lifeforms
• "Viginti Tres" (Latin for twenty-three) is a song by Tool on their album 10,000 Days
• Blink-182's song "What's My Age Again?" includes the lyrics "nobody likes you when you're 23."
• 23 is an album and title track by Blonde Redhead
• The Incubus song "Pardon Me" includes the lyrics "A decade ago, I never thought I would be, at 23, on the verge of spontaneous combustion, woe is me!" Frontman Brandon Boyd was 23 years old when he wrote the song and described himself as being "kind of obsessive about that number".^[49]
• "23" is a song by Jimmy Eat World, on their album Futures. The number also appears in the songs "Christmas Card" and "12."23".95" as well as on some items of clothing produced by the band.
• Four tet and Yellowcard
  both have songs titled "Twenty-Three".
• Dear 23, an album by The Posies
• Untitled 23, an album by The Church
• Noah23 has several albums which reference the number 23, such as Neophyte Phenotype, Rock Paper Scissors, and Upside Down Bluejay, all of which have 23 tracks. His stage name also references the number.
• "23 Minutes in Brussels", a song by Luna on their album Penthouse.
• The composer
  Biorhythms theory of Wilhelm Fliess, in which a 23-day cycle is considered significant,^[50] or because he first suffered an asthma attack on 23rd of the month.^{[51][importance?}
  ]
• "23" is a single by Mike Will Made It
• On the cover of The Beatles' 1969 album Yellow Submarine the number 23 is displayed on the chest of one of the Blue Meanies.
• Network 23 refers to members of the Spiral Tribe. Sometimes 23 used to discretely mark the spots of a freetekno rave.
• The number 23 is used a lot throughout the visuals and music by the band
  Rise Of The Ogre to the 23 enigma
  theory.

• 23 is a German film about Karl Koch.^[52]
• In Jeepers Creepers, the Creeper appears every 23 years for 23 days to feast on human body parts
• In L: Change the World, the protagonist L signs his own name in the Death Note notebook and somehow knows that he has given himself 23 days to live, revealing a 23-day rule for the maximum number of days a person may live after they are added to the Japanese god of death's Death Note.^[53]
• The 1980s TV series Max Headroom was set at Network 23.
• In The Big Lebowski, the main characters deliberately use only lane 23 at the bowling alley.^{[citation needed]}
• In The Matrix Reloaded, the Architect tells Neo it is of utmost importance to choose 23 people to repopulate Zion.
• In the TV series Lost, 23 is one of the 6 reoccurring numbers (4, 8, 15, 16, 23, 42) that appear frequently throughout the show.
• The Number 23 is a 2007 film starring Jim Carrey about a man who becomes obsessed with the 23 enigma.^[54]

Other fields

• 23 skidoo (phrase) (sometimes 23 skiddoo) is an American slang phrase popularized during the early 20th century. 23 skidoo has been described as "perhaps the first truly national fad expression and one of the most popular fad expressions to appear in the U.S".
• The 23 enigma, proposed by William S. Burroughs plays a prominent role in the plot of the Illuminatus! Trilogy by Robert Shea and Robert Anton Wilson.
• The 23, in South Africa, refers to the 23 conscientious objectors who publicly refused to do military service in the Apartheid army in 1987. The following years the number increased to 143 (in 1988) and 771 (in 1989), with Apartheid being dismantled from 1990 onwards.^[55]
• X-23 is a character in the Marvel Universe. She is named for being the 23rd attempt to create a female genetic twin of Wolverine after attempts to create a male clone failed.
• 23 is the number of times Julius Caesar was stabbed in the Theatre of Pompey.

In sports

• Each national team competing in the FIFA Women's World Cup is allowed a 23-player squad. This squad size has been in place since 2015.

References

External links

Wikiquote has quotations related to 23 (number).

Wikimedia Commons has media related to 23 (number).

• 23 facts, 23 images, 23 gallery, and links to other 23's