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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:





  • The claimed element ionium (symbol Io), before it was realised this was actually thorium-230


  • The two-letter ISO 639-1 language code for Ido, a constructed language
  • Indonesian Airlines' IATA airline designator
  • .io, the Internet country code top-level domain (ccTLD) for the British Indian Ocean Territory



Literature and mythology[edit]

  • 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 (mythology), daughter of Inachus in Greek mythology, and lover of Zeus who was turned into a cow
  • Io (opera), an unfinished acte de ballet (opera) by Jean-Philippe Rameau
  • Io Matua Kore, in some Māori traditions the supreme god

Modern fiction[edit]

  • Blind Io, the current king of the gods in Terry Pratchett's Discworld series of fantasy novels
  • Io (Babylon 5), a space station in the science fiction television show Babylon 5
  • Scylla Io, one of Poseidon's Marine Generals in the Saint Seiya series
  • Io, a hero in the 2013 video game Dota 2


  • Io Shirai (born 1990), Japanese professional wrestler
  • Io Perl-Strahan (born 2001), child actress and niece to Michael Strahan


Popular culture[edit]


See also[edit]