XO

For uses of X0 (X followed by zero), see X0 (disambiguation).

Xo or XO may refer to:

Food and drink

• XO sauce, a spicy seafood sauce
• XO, a grade of cognac, meaning "extra old"

Music

• XO (record label), a record label founded by artist The Weeknd
• XO (Elliott Smith album) (1998)
• XO (Leathermouth album) (2009)
• "XO" (song), a 2013 song by Beyoncé
• "XO", a song by The Eden Project
• "XO", a song by girl group Citizen Queen (2022)
• "XO", a song by Fall Out Boy from From Under the Cork Tree
• "XO", a 2010 song by Mike Posner from 31 Minutes to Takeoff
• "X.O.", a song by Luniz from the 1996 film soundtrack Original Gangstas
• "XO / The Host", a song by The Weeknd from his third mixtape Echoes of Silence

Science and technology

• XO Telescope or its exo-planet survey
• OLPC XO, a laptop produced by the One Laptop per Child association
• XO sex determination system, a chromosomal system used to designate sex of some species of insects, arachnids, and mammals
  • XO, heterogametic male designation under this system
• Turner syndrome, a genetic condition in which one of the sex chromosomes is absent
• Xanthine oxidase, an enzyme that catalyzes the oxidation of hypoxanthine to xanthine
• Crystal oscillator (deprecated abbreviation: XO), an electronic circuit

Other uses

• XO Communications, a telecom company
• XO Group, a media company
• Super Robot Wars XO, a 2006 tactical role-playing video game
• Executive officer or XO, as in a military or police force
• Kisses and Hugs or XO
• LTE International Airways's IATA airline code
• Xiomara "Xo" Villanueva, a character on Jane the Virgin

See also

• Chi Omega ("ΧΩ"), a National Panhellenic Conference women's fraternity
• Executive order (disambiguation), an edict by a member of the executive branch of a government
• Exo (disambiguation), multiple terms
• OX (disambiguation)
• Tic-tac-toe, a game using X's and O's
• X's and O's (disambiguation)
• Xbox One (XBO), a video game console by Microsoft
• XOXO (disambiguation)