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Not to be confused with I0 (disambiguation) (the letter I followed by zero).

Io, IO, I/O, i/o, or i.o. may refer to:

In arts and entertainment[edit]

Modern fiction[edit]

  • Io (opera), an unfinished acte de ballet (opera) by Jean-Philippe Rameau
  • Io (Babylon 5), a space station in the science fiction television show Babylon 5
  • Blind Io, the current king of the gods in Terry Pratchett's Discworld series of fantasy novels
  • Scylla Io, one of Poseidon's Marine Generals in the Saint Seiya series
  • International Operations, a fictional American Intelligence Agency in Wildstorm comics


Other uses in arts and entertainment[edit]

In business and economics[edit]

In language[edit]

  • i.o., in illo ordine, Latin phrase meaning "respectively" ("in that order")
  • Ido ( ISO 639-1 language code IO), a constructed language
  • Indirect object, the object that is the recipient of an action (by a verb)

In mythology[edit]

  • Io (mythology), daughter of Inachus in Greek mythology, and lover of Zeus who was turned into a cow
  • Io, an alternate spelling of the nereid Ino, later known as Leukothea, who in the Odyssey gave Odysseus a veil that allowed him to breathe underwater
  • Io Matua Kore, in some Māori traditions the supreme god


  • Io Shirai (born 1990), Japanese professional wrestler
  • iO Tillett Wright (borh 1985), American artist, director, photographer, writer, film maker, activist, and actor


In science and technology[edit]


Biology and medicine[edit]


  • .io, the Internet country code top-level domain (ccTLD) for the British Indian Ocean Territory
  • Io (programming language), a pure object-oriented programming language
  • IO.SYS, a system file in Microsoft DOS and Windows 95, 98 and ME
  • Input/output, the collection of interfaces that different functional units of an information processing system use to communicate with each other

Other uses in science and technology[edit]

  • Ionium (symbol Io), a claimed chemical element that was later realized to be thorium-230
  • Image orthicon tube, a TV camera used between 1946 and 1968

Other uses[edit]

See also[edit]