Io, IO, iO, I/O, i/o, or i.o. may refer to: * Io (mythology), daughter of Inachus in Greek mythology, and lover of Zeus who was turned into a cow *

Io (moon) Io (), or Jupiter I, is the innermost and third-largest of the four Galilean moons of the planet Jupiter. Slightly larger than Earth’s moon, Io is the fourth-largest moon in the Solar System, has the highest density of any moon, the strong ...

, a moon of Jupiter

Arts 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) IO (pronounced the English way 'eye-oh', as opposed to the German way 'ee-oh') is a German alternative rock band, formed in 2006 after the breakup of Guano Apes. Original Guano Apes members Henning Rümenapp (guitar), Stefan Ude ( bass) and Dennis ...

, a German band *

Io (English band) io is an English experimental rock band from Birmingham, England. The band currently consists of Al Lawson (guitar/vocals), Stu Atkins (guitar), Dave Wright (drums), and Steve Wood (bass). The band formed in 2006 after the collapse of two B ...

, an English band * I_o (musician), an American DJ and record producer (1990–2020)

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 The iO West (formerly known as the "ImprovOlympic West") was the Los Angeles branch of the IO Theater, iO in Chicago. The theater was located at 6366 Hollywood Blvd., in Hollywood, Los Angeles, Hollywood, California. In addition to presenting im ...

, a Los Angeles theater associated with the Chicago iO

Other uses in arts and media

* ''Io'' (film), a 2019 Netflix film *

iO Digital Cable Service Optimum is an American Internet, television, mobile and home phone company serving Arizona, Arkansas, California, Connecticut, Idaho, Kentucky, Louisiana, Mississippi, Missouri, New Jersey, New York, North Carolina, Oklahoma, Pennsylvania, Texas ...

, 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 Insertion may refer to: *Insertion (anatomy), the point of a tendon or ligament onto the skeleton or other part of the body *Insertion (genetics), the addition of DNA into a genetic sequence *Insertion, several meanings in medicine, see ICD-10-PCS ...

, 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 A collateralized mortgage obligation (CMO) is a type of complex debt security that repackages and directs the payments of principal and interest from a collateral pool to different types and maturities of securities, thereby meeting investor need ...

(CMO) or mortgage-backed security

Language

* i.o., ', 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)

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 Ino or INO may refer to: Arts and music *I-No, a character in the ''Guilty Gear'' series of video games *Ino (Greek mythology), a queen of Thebes in Greek mythology *INO Records, an American Christian music label *Ino Yamanaka, a character in th ...

, 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

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

Places on Earth

Io (island) Io ( el, Ίο), is an uninhabited Greek islet, close to the coast of Lasithi, eastern Crete, and in the Libyan Sea. It is part of the Lefki municipality. See also *List of islands of Greece Greece has many islands, with estimates ranging ...

, an uninhabited islet near Crete, Greece * Io, Norway, a village in Alver, Norway *

Mount Iō (disambiguation) Mount Iō also Mount Iwo may refer to: * Mount Iō (Akan), in Akan National Park in Hokkaidō. * Mount Iō (Iōjima), in Kagoshima prefecture on the island of Iōjima. * Mount Iō (Shiretoko), in Shiretoko National Park in Hokkaidō. * Mount Iō (Y ...

, name of several mountains in Japan * Indian Ocean

Science and technology

Astronomy

, a moon of Jupiter * 85 Io, an asteroid

Biology and medicine

* ''Io'' (gastropod), a genus of freshwater snail in the family Pleuroceridae *'' 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, in the local dialect * 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 * 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 The Bureau of International Organization Affairs (IO) is a bureau in the United States Department of State that creates and executes U.S. policy in the United Nations and other international organizations. It is headed by the Assistant Secreta ...

, 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