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

Io (mythology) Io (; grc, Ἰώ ) was, in Greek mythology, one of the mortal lovers of Zeus. An Argive princess, she was an ancestor of many kings and heroes, such as Perseus, Cadmus, Heracles, Minos, Lynceus, Cepheus, and Danaus. The astronomer Simon Marius ...

, 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 IO Interactive A/S (IOI) is a Danish video game developer based in Copenhagen, best known for creating and developing the ''Hitman'' and '' Kane and Lynch'' franchises. IO Interactive's most recent game is '' Hitman 3'', which was released in J ...

, a Danish computer game developer

Music

* IO (German band), a German band * Io (English band), an English band *

I_o (musician) Garrett Falls Lockhart (May 16, 1990 – November 23, 2020), known professionally by his stage name i_o, was an American electronic dance music DJ and record producer. Early life Garret Falls Lockhart was born on May 16, 1990, in Richmond, ...

, 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 iO, or iO Chicago, (formerly known as "ImprovOlympic") is an improv theater and training center in central Chicago, with a former branch in Los Angeles, called iO West and in Raleigh, North Carolina called iO South. The theater taught and hosted ...

(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 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 An international organization or international organisation (see spelling differences), also known as an intergovernmental organization or an international institution, is a stable set of norms and rules meant to govern the behavior of states a ...

'', a peer-reviewed journal that covers the entire field of international affairs

Business and economics

Industrial and organizational psychology Industrial and organizational psychology (I-O psychology), an applied discipline within psychology, is the science of human behavior in the workplace. Depending on the country or region of the world, I-O psychology is also known as occupationa ...

, the field of psychology that studies work, academic, and other organizational issues *

Industrial organization In economics, industrial organization is a field that builds on the theory of the firm by examining the structure of (and, therefore, the boundaries between) firms and markets. Industrial organization adds real-world complications to the perf ...

, 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-PC ...

, a business document specifying the inventory goal of an advertising campaign *

Integrated operations In the Petroleum industry, Integrated operations (IO) refers to the integration of people, disciplines, organizations, work processes and information and communication technology to make smarter decisions. In short, IO is collaboration with focus o ...

, 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) ''Io'' (Church Slavonic: Ιω, Їѡ and Иѡ, also Iωан and Iωнь; Romanian Cyrillic: Iѡ; el, Ίω) is the contraction of a title used mainly by the royalty ( hospodars or voivodes) in Moldavia and Wallachia, preceding their names and ...

, a particle of a title used by Moldavian and Wallachian Princes-regnant *

Ido language Ido () is a constructed language derived from Reformed Esperanto, and similarly designed with the goal of being a universal second language for people of diverse backgrounds. To function as an effective ''international auxiliary language'', ...

(ISO 639-1 language code IO), a constructed language *

Indirect object In linguistics, an object is any of several types of arguments. In subject-prominent, nominative-accusative languages such as English, a transitive verb typically distinguishes between its subject and any of its objects, which can include but ...

, the object that is the recipient of an action (by a verb)

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 Io Matua Kore is often understood as the supreme being in Polynesian narrative, particularly of the Māori people. Io does seem to be present in the mythologies of other Polynesian islands including Hawai‘i, the Society Islands, and the Coo ...

, in some Māori traditions the supreme god

People

*, Japanese shogi player *, Japanese manga artist *

Io Shirai is a Japanese professional wrestler currently signed to WWE, where she performs on the Raw brand under the ring name Iyo Sky (stylized in all caps). She is a member of Damage CTRL and one-half of the current WWE Women's Tag Team Champions ...

(born 1990), Japanese professional wrestler *, Japanese manga artist *

iO Tillett Wright iO Tillett Wright (born September 2, 1985) is an American author, photographer, actor, TV and podcast host, and activist. After growing up in New York City, he founded street art magazine '' Overspray'' and served as its editor-in-chief until 2 ...

(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 Io is a village in Alver municipality, in Vestland county, Norway. The village sits on the shore of the Herdlefjorden along the northern coast of the island of Holsnøy, about southwest of the village of Rossland. See also *List of short pl ...

, a village in Alver, Norway * Mount Iō (disambiguation), name of several mountains in Japan *

Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or ~19.8% of the water on Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by ...

Science and technology

Astronomy

, a moon of Jupiter *

85 Io Io ( minor planet designation: 85 Io is carbonaceous asteroid from the central region of the asteroid belt, approximately 170 kilometers in diameter. It is an identified Eunomian interloper. Discovery and naming It was discovered by C. H. ...

, an asteroid

Biology and medicine

* ''Io'' (gastropod), a genus of freshwater snail in the family Pleuroceridae *''

Automeris io ''Automeris io'', the Io moth () or peacock moth, is a colorful North American moth in the family Saturniidae. The io moth is also a member of the subfamily Hemileucinae. The name Io comes from Greek mythology in which Io was a mortal lover of ...

'', a moth species in North America *''

Aglais io ''Aglais io'', the European peacock, more commonly known simply as the peacock butterfly, is a colourful butterfly, found in Europe and temperate Asia as far east as Japan. It was formerly classified as the only member of the genus ''Inachis'' ...

'', the European peacock butterfly *

Intraosseous infusion Intraosseous infusion (IO) is the process of injecting medications, fluids, or blood products directly into the marrow of a bone; this provides a non-collapsible entry point into the systemic venous system. The intraosseous infusion technique i ...

, the medical process of introducing medication directly into the bone marrow *

Hawaiian hawk The Hawaiian hawk or ''io'' (''Buteo solitarius'') is a raptor in the genus '' Buteo'' endemic to Hawaii, currently restricted to the Big Island. The ''io'' is one of two extant birds of prey that are native to Hawaii, the other being the ''pueo' ...

, 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) Io is a pure object-oriented programming language inspired by Smalltalk, Self, Lua, Lisp, Act1, and NewtonScript. Io has a prototype-based object model similar to the ones in Self and NewtonScript, eliminating the distinction between inst ...

, a pure object-oriented programming language *

IO.SYS is an essential part of MS-DOS and Windows 9x. It contains the default MS-DOS device drivers (hardware interfacing routines) and the DOS initialization program. Boot sequence In the PC bootup sequence, the first sector of the boot disk is ...

, a system file in Microsoft DOS and Windows 95, 98 and ME *

Indistinguishability obfuscation In cryptography, indistinguishability obfuscation (abbreviated IO or iO) is a type of software obfuscation with the defining property that obfuscating any two programs that compute the same mathematical function results in programs that cannot be ...

, a cryptographic tool to obscure computer code *

Input/output In computing, input/output (I/O, or informally io or IO) is the communication between an information processing system, such as a computer, and the outside world, possibly a human or another information processing system. Inputs are the signals ...

, 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 Video camera tubes were devices based on the cathode ray tube that were used in television cameras to capture television images, prior to the introduction of charge-coupled device (CCD) image sensors in the 1980s. Several different types of tubes ...

, 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 Indonesian Airlines (PT Indonesian Airlines Aviapatria) was an airline based in Jakarta, Indonesia. It operated domestic services. The Transportation Ministry in February 2007 delayed license revocation of 11 idle airlines, including Indonesi ...

(IATA airline designator IO) *Investigating Officer, a member of

law enforcement in the United Kingdom Law enforcement in the United Kingdom is organised separately in each of the legal systems of the United Kingdom: England and Wales, Northern Ireland and Scotland. Most law enforcement is carried out by police officers serving in regional po ...

who heads an investigation * Mitsubishi Pajero iO, a mini SUV model produced by Mitsubishi Motors