O (disambiguation)

O is the fifteenth letter of the modern Latin alphabet.

O may also refer to:

Letters

• Օ, a letter in the Armenian alphabet
• O (Cyrillic), a letter of the Cyrillic alphabet
• O (kana), a romanization of the kana (お and オ) in Japanese writing
• ㅇ, a consonant in Hangul, the Korean alphabet
• ဝ, a consonant in Burmese script
• /o/, the International Phonetic Alphabet symbol for a close-mid back rounded vowel
• O, an IRC operators service in QuakeNet's IRC services

Science

• O, chemical symbol for oxygen
• O, a human blood type, the universal donor
• Haplogroup O (Y-DNA), a Y-chromosomal DNA haplogroup
• O, for pyrrolysine an alpha amino acid in biochemistry
• Class O, stellar classification for very hot bluish stars

Linguistics

• O word, an antiquated vocative placed before a name of, or phrase characterizing, the party being addressed in speech
• O (also P), the patient-like argument (object) of a canonical transitive verb

Mathematics

• Big O notation, used to describe the asymptotic behavior of a function or algorithm
• O, for orthogonal group
• o indicates function composition or composition of morphisms in a category
• $\mathcal{O}$, a category of Lie algebra representations
• o, for octet, an information measure unit used in computing

Surname

• O (surname), Korean and Japanese surnames romanized "O" or "Oh"
• Ou (surname), Chinese and Cantonese surnames pronounced "O" or "Oh"
• A prefix meaning "grandson (of)", appearing in Irish surnames
• Genovevo de la O (1876-1952) - Mexican revolutionary

Locations

• O Brook, a short river in Devon, England
• Essie's Original Hot Dog shop (commonly known as "The O"), a restaurant in Pittsburgh, Pennsylvania

Arts and entertainment

Films and television

• O (film), 2001 film starring Josh Hartnett, Mehki Phifer and Julia Stiles

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
• O, fictional character from the French erotic novel Story of O

Media and publications

• O, The Oprah Magazine, magazine founded by Oprah Winfrey
• «O», an international fetish magazine

Music

• O (Damien Rice album), 2002
• O (Eiko Shimamiya album), 2006
• O (Omarion album), 2005
  • "O" (song), the title song
• o (Tilly and the Wall album), 2008
• O, 2002 album by Zone
• "O" (Coldplay song), 2014
• "o", a song by iamamiwhoami

Sports

• O (gesture), a gesture used to show support for the sports teams of the University of Oregon

Others

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

History

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

See also

• Mr. O (TV show)
• Zero (disambiguation)
• Big O (disambiguation)