Io

Io most commonly refers to:

  • Io (moon), a moon of Jupiter
  • Io (mythology), daughter of Inachus in Greek mythology, and lover of Zeus who was turned into a cow
Look up -io, IO, Io, or io in Wiktionary, the free dictionary.

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

Arts, entertainment and media

Fictional elements
  • Scylla Io, one of Poseidon's Marine Generals in the Saint Seiya series
  • A Dungeons & Dragons dragon deity
  • Io Otonashi, a main character in the Japanese manga series Place to Place (Acchi Kocchi)

Gaming
  • iO, a 2014 video game by Gamious
  • IO Interactive, a Danish computer game developer

Music
  • IO (German band), a German band
  • Io (English band), an English band
  • I_o (musician), an American DJ and record producer (1990–2020)
  • i/o (Peter Gabriel album), 2023

Theatre and opera
  • Io (opera), an unfinished acte de ballet (opera) by Jean-Philippe Rameau
  • iO Theater (ImprovOlympic), a theater in Chicago, Illinois, dedicated to improvisational comedy
  • IO West, a Los Angeles theater associated with the Chicago iO

Other uses in arts, entertainment and media
  • EO (original Polish title: IO), a 2022 Jerzy Skolimowski film
  • Io (film), a 2019 Netflix film
  • iO Digital Cable Service, a service offered by Cablevision
  • International Organization, a peer-reviewed journal that covers the entire field of international affairs

Business and economics
  • Industrial and organizational psychology, the field of psychology that studies work, academic, and other organizational issues
  • Industrial organization, the field of economics that studies the strategic behavior of firms, the structure of markets and their interactions
  • Insertion order, a business document specifying the inventory goal of an advertising campaign
  • Integrated operations, a term used in the petroleum industry describing new work processes and ways of working that have been facilitated by modern information and communication technologies
  • Interest-only, a type of collateralized mortgage obligation (CMO) or mortgage-backed security

Language
  • i.o., in illo ordine, Latin phrase meaning "respectively" ("in that order")
  • Io (princely title), a particle of a title used by Moldavian and Wallachian Princes-regnant
  • Ido language (ISO 639-1 language code IO), a constructed language
  • Indirect object, the object that is the recipient of an action (by a verb)
  • Yo, also referred to as Io

Mythology
  • 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

People
  • Io Murota (室田 伊緒, born 1989), Japanese shogi player
  • Io Sakisaka (咲坂 伊緒), Japanese manga artist
  • Io Shirai (born 1990), Japanese professional wrestler
  • Iou Kuroda (黒田 硫黄, born 1971), Japanese manga artist
  • iO Tillett Wright (born 1985), American artist, director, photographer, writer, film maker, activist, and actor

Places on Earth
  • British Indian Ocean Territory, ISO 3166-1 alpha-2 code
  • Io (island), an uninhabited islet near Crete, Greece
  • Io, Norway, a village in Alver, Norway
  • Mount Iō (disambiguation), name of several mountains in Japan
  • Indian Ocean

Science and technology

Astronomy

Biology and medicine
  • Io (gastropod), a genus of freshwater snail in the family Pleuroceridae
  • Io (plant), a genus of plant in the tribe Senecioneae
  • Automeris io, a moth species in North America
  • Aglais io, the European peacock butterfly
  • Intraosseous infusion, the medical process of introducing medication directly into the bone marrow
  • Hawaiian hawk (Hawaiian: ʻio)
  • Immuno-oncology, another term for cancer immunotherapy

Computing
  • .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
  • Indistinguishability obfuscation, a cryptographic tool to obscure computer code
  • 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
  • Ionium (symbol Io), a claimed chemical element that was later realized to be thorium-230
  • Iodine monoxide (symbol IO)
  • Image orthicon tube, a TV camera used between 1946 and 1968
  • Infinitely often, a mathematics term sometimes written "i.o."; see an example in set-theoretic limit

Other uses
  • Bureau of International Organization Affairs, in the U.S. Department of State
  • Government Printing Bureau (Macau), known in Portuguese as the Imprensa Oficial or "IO"
  • Indonesian Airlines (IATA airline designator IO)
  • Investigating Officer, a member of law enforcement in the United Kingdom who heads an investigation
  • Mitsubishi Pajero iO, a mini SUV model produced by Mitsubishi Motors
  • IO (Oral-B), a series of electric toothbrushes by Oral-B

See also
  • Ю or yu, a Cyrillic letter
  • I/O (disambiguation)
  • IOS (disambiguation)
  • I0 (disambiguation) (the letter "I" followed by the digit "0")
  • 10 (disambiguation) (the digit "1" followed by the digit "0")
  • 1O (disambiguation) (the digit "1" followed by the letter "O")
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