O (disambiguation)

O is the fifteenth letter of the modern Latin alphabet.

For the Underoath album, see Ø (Disambiguation).

O may also refer to:

Letters

• Օ (Unicode: U+0555) 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

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
• O (for Octavius, meaning an eight of a gallon), an apothecary's symbol for a pint

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

• ${\displaystyle f=O(g)}$, a Bachmann–Landau notation in computational complexity theory ("|f| is bounded above by g asymptotically")
• ${\displaystyle f=o(g)}$, a Bachmann–Landau notation in computational complexity theory ("f is dominated by g asymptotically")
• O, for orthogonal group
• ∘ indicates function composition, or composition of morphisms in a category
• ${\displaystyle {\mathcal {O}}}$, a category of Lie algebra representations
• o, for octet, an information measure unit used in computing

Media

• O Channel, television station in Indonesia
• O, an IRC operator service in QuakeNet's IRC services

Surname

• O (surname), Korean surname romanized "O" or "Oh"
• Ō (Japanese surname), Japanese surname derived from the Chinese surname Wang(王)
• 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
• Karen O, born Karen Lee Orzolek, American singer

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

Film and television

• O (film), 2001 film starring Josh Hartnett, Mekhi 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
• "O" Is for Outlaw, the fifteenth novel in Sue Grafton's "Alphabet mystery" series, published in 1999

Media and publications

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

Music

• "O (Oh!)", 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 (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
• Baltimore Orioles, 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

History

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

Other uses

• Oreo O's, an American breakfast cereal available internationally
• Oscar, the military time zone code for UTC−02:00: List of military time zones#O

See also

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