XX

For technical reasons, "X_X" and similar titles redirect here. For the keyboard symbol, see List of emoticons.

XX or xx may refer to:

• 20 (number), Roman numeral XX

Film and TV

• XX (film), a 2017 anthology horror film
• "XX", an episode of CSI: Crime Scene Investigation (season 4)
• XX, the production code for the 1969 Doctor Who serial The Seeds of Death
• XX (web series), a 2020 South Korean web series
• XX (organization), a fictional organisation in the comic and game XIII

Genetics

• XX sex chromosomes, in the XY sex-determination system
  • XX male syndrome, also known as de la Chapelle syndrome, a rare congenital intersex condition resulting in a phenotypical male with two X chromosomes
  • XX gonadal dysgenesis, a type of female hypogonadism resulting in non-functioning ovaries
• XX sex chromosomes, in the XO sex-determination system
• a female, an organism producing ova gametes that fuse with the male gamete during sexual reproduction, typically having two X chromosomes in the XY and X0 sex determination systems

Music

• The xx, an English indie rock band
• X_______X (band), an American no wave band

Albums

• Toto XX, a 1998 album by Toto
• XX (Mushroomhead album), 2001
• xx (The xx album), 2009
• XX (Great Big Sea album), 2012
• XX – Two Decades of Love Metal, a 2012 compilation album by HIM
• XX (O.A.R. album), 2016
• XX (Mino album), 2018
• XX, a 2018 album by Note-oriety
• + + (EP), a 2018 EP, repackaged as [X X] in 2019, by Loona

Songs

• "xx", a song by Hayley Kiyoko from Expectations
• "XX", a song by Feid from Ferxxo (Vol 1: M.O.R)

Organisations

• XX Bomber Command, an inactive United States Air Force unit
• XX Corps (disambiguation)
• Legio XX Valeria Victrix or Legion XX, a legion of the Roman Empire

Other uses

• XX (novel), a 2020 novel by Rian Hughes
• XX System or Double-Cross System, a British deception operation in the Second World War
• Les XX, a group of twenty Belgian painters
• Dos Equis or XX, a brand of Mexican beer
• xx, to express exponentiation in the initial version of the FORTRAN programming language

See also

• All pages with titles containing XX
• 20 (disambiguation)
• Double Cross (disambiguation)
• X (disambiguation)
• XXX (disambiguation)
• XXXX (disambiguation)