O (disambiguation)
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "O_(disambiguation)".

Look up o in Wiktionary, the free dictionary.

O is the fifteenth letter of the modern Latin alphabet.

O may also refer to:

In science and mathematics

• Haplogroup O (Y-DNA), a Y-chromosomal DNA haplogroup
• Big O notation, used to describe the asymptotic behavior of a function or algorithm
• O, chemical symbol for Oxygen
• O, a human blood type, the universal donor
• O, for Orthogonal group
• o indicates function composition or composition of morphisms in a category

In arts and entertainment

• O (Damien Rice album), a 2002 album by Damien Rice
• O (Omarion album), a 2005 album by Omarion
• o (Tilly and the Wall album), a 2008 album by Tilly and the Wall
• O (film), a 2001 film starring Josh Hartnett, Mehki Phifer and Julia Stiles
• O, The Oprah Magazine, a magazine founded by Oprah Winfrey
• O (Cirque du Soleil), a show at the Bellagio hotel and casino in Las Vegas, Nevada
• O, a fictional character from the French erotic novel Story of O

Other

• O (name), a Chinese and Japanese family name
• O (kana), a romanization of the kana (お and オ) in Japanese writing
• O class battlecruiser, class of German ships in the 1930s
• Class O, stellar classification for very hot bluish stars
• /o/, the International Phonetic Alphabet symbol for a close-mid back rounded vowel
• «O», an international fetish magazine published in Germany

See also

• The O, disambiguation
• Zero, disambiguation

This disambiguation page lists articles associated with the same Latin letter. If an internal link led you here, you may wish to change the link to point directly to the intended article.