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O, or o, is the fifteenth letter of the English alphabet. O may also refer to:


Letters

* Օ օ, (Unicode: U+0555, U+0585) a letter in the
Armenian alphabet The Armenian alphabet (, or , ) or, more broadly, the Armenian script, is an alphabetic writing system developed for Armenian and occasionally used to write other languages. It is one of the three historical alphabets of the South Caucasu ...
* Ο ο,
Omicron Omicron (, ; uppercase Ο, lowercase ο, ) is the fifteenth letter of the Greek alphabet. This letter is derived from the Phoenician letter ayin: . In classical Greek, omicron represented the close-mid back rounded vowel in contrast to '' o ...
, (Greek), a letter in the Greek alphabet *
O (Cyrillic) O (О о; italics: ''О о'') is a letter of the Cyrillic script. The letter most commonly represents the sound /ɔ/, like the o in "off". In Russian language, Russian and Serbo-Croatian, it represents the sound /o/. History The Cyrillic le ...
, a letter of the Cyrillic alphabet *
O (kana) In Japanese writing, the kana お (hiragana) and オ (katakana) occupy the fifth place, between え and か, in the modern Gojūon (五十音) system of collating kana. In the Iroha, they occupy the 27th, between の and く. In the table at ...
, a romanization of the kana (お and オ) in Japanese writing *
Ieung (sign: ㅇ; ) is a consonant letter of the Korean alphabet, Hangul. It is silent when used at the beginning of a syllable (it is a consonant placeholder in vowel letters). However, ㅇ might take on the glottal stop The glottal stop or ...
, a consonant in Hangul, the Korean alphabet *
The Burmese alphabet (, MLC Transcription System, MLCTS: ''mranma akkha.ya'', ) is an abugida used for writing Burmese language, Burmese, based on the Mon–Burmese script. It is ultimately adapted from a Brahmic scripts, Brahmic script, eithe ...
, a consonant in Burmese script


Arts and entertainment


Film and television

* ''O'' (2001 film), a film starring Mekhi Phifer, Josh Hartnett, and Julia Stiles * ''O'' (2022 film), an Indian Kannada-language horror thriller film


Literature

* '' O: A Presidential Novel'', anonymous novel published in 2011 * O, fictional planet that is the setting of several short stories by science fiction author
Ursula K. Le Guin Ursula Kroeber Le Guin ( ; Kroeber; October 21, 1929 – January 22, 2018) was an American author. She is best known for her works of speculative fiction, including science fiction works set in her Hainish universe, and the ''Earthsea'' fantas ...
* O, fictional character from the French erotic novel ''
Story of O ''Story of O'' (, ) is an erotic novel written by French author Anne Desclos under the pen name Pauline Réage, with the original French text published in 1954 by Jean-Jacques Pauvert. Desclos did not reveal herself as the author until 1994, ...
'' * '' "O" Is for Outlaw'', the fifteenth novel in Sue Grafton's "Alphabet mystery" series, published in 1999


Media and publications

* ''
O, The Oprah Magazine ''O, The Oprah Magazine'', also known simply as ''O'', is an American monthly magazine founded by talk show host Oprah Winfrey and Hearst Communications. In 2021, Winfrey and Hearst rebranded it as ''Oprah Daily''. Overview It was first pu ...
'', magazine founded by Oprah Winfrey * ''O'' (German magazine), a fetish magazine


Music

* "
O (Oh!) "O (Oh!)" is a song written by Byron Gay and Arnold Johnson and performed by Ted Lewis and His Band. It reached No. 13 on the U.S. pop chart in 1920. Other charting versions * Pee Wee Hunt and His Orchestra released a version of the song which ...
", 1920 by Ted Lewis, 1953 by Pee Wee Hunt * ''O'' (A.C. Acoustics album), 2002 * ''O'' (Damien Rice album), 2002 * ''O'' (Eiko Shimamiya album), 2006 * ''O'' (Omarion album), 2005 ** "O" (Omarion song), the title song * ''O'' (Oval album), 2010 * ''o'' (Tilly and the Wall album), 2008 * ''O'' (EP), a 2023 EP by Yuju * ''O'', 2002 album by
Zone Zone, Zones or The Zone may refer to: Places Military zones * Zone, any of the divisions of France during the World War II German occupation * Zone, any of the divisions of Germany during the post-World War II Allied occupation * Korean Demilit ...
* "O", a 2014 song by Coldplay from ''
Ghost Stories A ghost story is any piece of fiction, or drama, that includes a ghost, or simply takes as a premise the possibility of ghosts or characters' belief in them."Ghost Stories" in Margaret Drabble (ed.), ''Oxford Companion to English Literature''. ...
'' * "o", a song by
iamamiwhoami iamamiwhoami ( ) is an electronic music and audiovisual project led by Swedish singer-songwriter Jonna Lee (singer), Jonna Lee in collaboration with producer Claes Björklund. Since 2009, the project has released a series of audiovisual works ...
* "O!", a song by the American band Bright from ''
The Albatross Guest House Bright is a post-rock and ambient music group based in Brooklyn, New York. History Bright self-released a cassette before signing deals with two independent labels, Ba Da Bing! Records and Darla Records, and releasing records alternately on bo ...
'', 1997 *
O (musician) Otis "O" Barthoulameu (1962 or 1963 – February 16, 2023) was an American rock musician and record producer. He performed with a number of bands including Fluf, Olivelawn, and Reeve Oliver, and produced early Blink-182 Blink-182 is an ...
, nickname of the American musician Otis Barthoulameu


Sports

*
O (gesture) The "O" is a gesture used predominantly at the University of Oregon (UO) in Eugene, Oregon, United States, and especially at events in which the school's athletic teams, the Oregon Ducks, are taking part. The gesture is used to show support for th ...
, a gesture used to show support for the sports teams of the University of Oregon *
Baltimore Orioles The Baltimore Orioles (also known as the O's) are an American professional baseball team based in Baltimore. The Orioles compete in Major League Baseball (MLB) as a member club of the American League (AL) East Division. As one of the America ...
, an American Major League Baseball team, among whose common nicknames are "O's" and "The O's"


Others

* ''O'' (Cirque du Soleil), show at the Bellagio hotel and casino in Las Vegas, Nevada


Companies

* Essie's Original Hot Dog shop (commonly known as "The O"), a restaurant in Pittsburgh, Pennsylvania *
Overstock.com Beyond, Inc. (formerly known as Overstock, Inc.) is an American internet retailer, online retailer that owns the "Bed Bath & Beyond" brand except for within Mexico and the "Overstock" brand, and runs online stores named with those brands. The M ...
, online retailer previously known as O.co *
Realty Income Realty Income Corporation is a real estate investment trust that invests in free-standing, single-tenant commercial properties in the United States, the United Kingdom, and six other countries in Europe. These properties are subject to NNN Leases ...
, American real estate investment trust (NYSE stock ticker O)


History

* O-class battlecruiser, class of German ships in the 1930s * The O (political group) (The Organization), a 1970s American political group


Linguistics

* /o/,
close-mid back rounded vowel The close-mid back rounded vowel, or high-mid back rounded vowel, is a type of vowel sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is . Close-mid back protruded vowel The clo ...
in the International Phonetic Alphabet * O, an antiquated
vocative In grammar, the vocative case (abbreviated ) is a grammatical case which is used for a noun that identifies a person (animal, object, etc.) being addressed or occasionally for the noun modifiers (determiners, adjectives, participles, and numeral ...
placed before a name of, or phrase characterizing, the party being addressed * O (also P), the patient-like argument (object) of a canonical transitive verb *O, gender neutral third person pronoun in the Turkish language * O-, an honorific prefix used in the
Japanese language is the principal language of the Japonic languages, Japonic language family spoken by the Japanese people. It has around 123 million speakers, primarily in Japan, the only country where it is the national language, and within the Japanese dia ...


Mathematics

* f = O(g), a Bachmann–Landau notation in computational complexity theory (", ''f'', is bounded above by ''g'' asymptotically") * f = o(g), a Bachmann–Landau notation in computational complexity theory ("''f'' is dominated by ''g'' asymptotically") * O, for
orthogonal group In mathematics, the orthogonal group in dimension , denoted , is the Group (mathematics), group of isometry, distance-preserving transformations of a Euclidean space of dimension that preserve a fixed point, where the group operation is given by ...
* ∘ indicates
function composition In mathematics, the composition operator \circ takes two function (mathematics), functions, f and g, and returns a new function h(x) := (g \circ f) (x) = g(f(x)). Thus, the function is function application, applied after applying to . (g \c ...
, or composition of morphisms in a category * Category O or \mathcal, a category of Lie algebra representations * o, for
octet Octet may refer to: Music * Octet (music), ensemble consisting of eight instruments or voices, or composition written for such an ensemble ** String octet, a piece of music written for eight string instruments *** Octet (Mendelssohn), 1825 compo ...
, an information measure unit used in computing


Media

* O, an IRC operator service in QuakeNet's IRC services * O Channel, the former name of Moji a television network in Indonesia


Places

*
O Brook The O Brook is a short right-bank tributary of the West Dart River on Dartmoor in Devon, England. It lies near the village of Hexworthy, and the lower part of the stream forms the boundary between the parishes of Holne and Dartmoor Forest D ...
, a short river in Devon, England * O'Block, a colloquial name for the Parkway Garden Homes in Chicago


Science

*
Oxygen Oxygen is a chemical element; it has chemical symbol, symbol O and atomic number 8. It is a member of the chalcogen group (periodic table), group in the periodic table, a highly reactivity (chemistry), reactive nonmetal (chemistry), non ...
, symbol O, a chemical element * O, a human
blood type A blood type (also known as a blood group) is based on the presence and absence of antibody, antibodies and Heredity, inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycop ...
, the universal donor *
Haplogroup O (Y-DNA) Haplogroup O, also known as O-M175, is a human Y-chromosome DNA haplogroup. It is primarily found among populations in Southeast Asia and East Asia. It also is found in various percentages of populations of the Russian Far East, South Asia, Cent ...
, a Y-chromosomal DNA haplogroup * O, for
pyrrolysine Pyrrolysine (symbol Pyl or O), encoded by the 'amber' stop codon UAG, is a proteinogenic amino acid that is used in some methanogenic archaea and in bacteria. It consists of lysine with a 4-methylpyrroline-5-carboxylate in amide linkage with the ...
an alpha amino acid in biochemistry *
O-type star An O-type star is a hot, blue star of spectral type O in the Yerkes classification system employed by astronomers. They have surface temperatures in excess of 30,000 kelvins (K). Stars of this type have strong absorption lines of ionised h ...
, stellar classification for very hot bluish stars * O (for ''Octavius'', meaning an eighth of a gallon), an apothecary's symbol for a
pint The pint (, ; symbol pt, sometimes abbreviated as ''p'') is a unit of volume or capacity in both the imperial and United States customary measurement systems. In both of those systems, it is one-eighth of a gallon. The British imperial pint ...


Surname

*
O (surname) Oh or O is a family name in Korea. It is written using the hanja characters, 吳, 五, 伍, 吾, and 晤. According to the 2015 census in South Korea, there were 763,281 people carrying the O surname. History The earliest ancestor of the Kore ...
, Korean surname romanized "O" or "Oh" * Ō (Japanese surname), Japanese surname derived from the Chinese surname Wang (王) *
Ō clan is a descendant clan of Jimmu and Himetataraisuzu-hime. They are descended from Kamuyaimimi. Ō no Yasumaro was a famous member. He became head of the clan in 716 around the time he wrote the Kojiki.''Obunsha Japanese Encyclopedia 3rd Edition ...
a historical Japanese clan with an unrelated surname *
Ou (surname) Ou is the pinyin romanization of the Chinese surnames and , which share a common origin with the compound surname Ouyang (), from the ruling family of the State of Yue during the Spring and Autumn period. They are commonly romanized as Au or ...
, Chinese and Cantonese surnames pronounced "O" or "Oh" * A prefix meaning "grandson (of)", appearing in
Irish surnames A formal Irish name consists of a given name and a surname. In the Irish language, most surnames are patronymic surnames (distinct from patronyms, which are seen in Icelandic names for example). The form of a surname varies according to whether ...
*
Genovevo de la O Genovevo de la O (January 3, 1876 – June 12, 1952) was an important figure in the Mexican Revolution in Morelos. He was born in Santa María Ahuacatitlán, Morelos,Genovevo de la O accessed Dec 28, 2018 to sharecropper parents. He was ...
(1876-1952), Mexican revolutionary *
Karen O Karen Lee Orzolek (born November 22, 1978) is a South Korean-born American singer, musician, and songwriter. She is best known as the lead vocalist of the indie rock band the Yeah Yeah Yeahs. Early life Karen Lee Orzolek was born in Seoul, So ...
, born Karen Lee Orzolek, American singer


Other uses

*
Oreo O's Oreo O's is a breakfast cereal that consists of Oreo-flavored O-shaped pieces of cereal. It was conceived of by an Ogilvy & Mather NYC advertising employee and introduced in 1997 by Post Cereals. In 2001 the cereal got a new recipe with real crem ...
, an American breakfast cereal available internationally * Oscar, the military time zone code for UTC−02:00: List of military time zones#O * , the official West Japan Railway Company service symbol for the
Osaka Loop Line The is a railway Circle route, loop line in Japan operated by the West Japan Railway Company (JR West). It encircles central Osaka. Part of a second, outer loop line, the Osaka Higashi Line, from Hanaten Station, Hanaten to Kyuhoji Station, Kyuh ...
.


See also

* * Mr. O (TV show) *
Circle (disambiguation) A circle is a simple geometric shape. Circle or circles may also refer to: Humanities * Social circle, a group of socially interconnected people * Circle time Transportation *Traffic circle, a type of circular intersection in which traffic must ...
*
Circle symbol (disambiguation) Circle symbol may refer to: Art and Music *, music symbol denoting a: **diminished triad **diminished seventh chord *, an Ensō, a hand drawn circle in Zen art Language *˚, ring diacritic *º, masculine ordinal indicator *o, a common superior ...
*
Zero (disambiguation) Zero is a number. Zero or Zeros may also refer to: Arts, entertainment and media Comics * Zero (Marvel Comics), several characters in the Marvel Comics Universe * ''Zero'' (manhwa), a Korean manhwa by Dall-Young Lim and Park Sung-woo * ''Zero ...
*
Big O (disambiguation) Big O or The Big O may refer to: Mathematics and computing * Big Omega function (disambiguation), various arithmetic functions in number theory * Big O notation, asymptotic behavior in mathematics and computing ** Time complexity in computer scie ...
*
Omicron (disambiguation) Omicron (Ο or ο) is the 15th letter of the Greek alphabet. Omicron, Omikron, Ο or ο may also refer to: Science * SARS-CoV-2 Omicron variant, a variant of the virus that causes COVID-19 * Omicron (wasp), ''Omicron'' (wasp), a genus of wasps * ...
including Ο/ο {{disambiguation