XO

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

Xo or XO may refer to:

Arts, media, and entertainment

• Super Robot Wars XO, a 2006 tactical role-playing video game
• XO Group, a media company
• X-O Manowar, a Valiant Comics superhero
• Xiomara "Xo" Villanueva, a character on Jane the Virgin, an American satirical telenovela

Music

• XO (group), British girl group
• XO (record label), founded by the Weeknd
• Miami XO, American rapper
• XO (Elliott Smith album), 1998
• XO (Leathermouth album), 2009

Songs

• "XO" (song), 2013, by Beyoncé from her self-titled studio album
• "XO", 2005, by Fall Out Boy from the album From Under the Cork Tree
• "XO", 2010, by Mike Posner from the album 31 Minutes to Takeoff
• "XO", 2015, by The Eden Project
• "XO", 2022, by girl group Citizen Queen
• "Xo", 2022, by Stand Atlantic from the album F.E.A.R.
• "XO (Only If You Say Yes)", by K-pop boy group Enhypen
• "X.O.", 1996, by Luniz from the film soundtrack Original Gangstas
• "XO / The Host", 2011, by the Weeknd from his third mixtape Echoes of Silence

Food and drink

• XO sauce, a spicy seafood-based dressing sauce
• XO (extra old), a grade of cognac liquor

Science and technology

• XO Telescope or its exo-planet survey
• Xylenol orange, a chemical indicator for metal ions, used in titrations

Computing and electronics

• OLPC XO, a laptop produced by the One Laptop per Child association
• XO Communications, a telecom company
• Crystal oscillator (deprecated abbreviation: XO), an electronic circuit

Biology

• 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

Other uses

• Executive officer or XO, as in a military or police force
• Hugs and kisses or XO
• LTE International Airways's IATA airline code

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)