An abbreviation

• I.O.
  I.O.
  iO, or iO Chicago, is a theater located at 3541 N. Clark St., in Chicago, Illinois, one-half block south of Wrigley Field, home of the Chicago Cubs baseball team. The theater both has performances of, and teaches improvisational comedy. It was founded in the 1980s by Del Close and Charna Halpern...
  
  , a theater in Chicago, Illinois dedicated to improvisational comedy
• i.o.
  I.O.
  iO, or iO Chicago, is a theater located at 3541 N. Clark St., in Chicago, Illinois, one-half block south of Wrigley Field, home of the Chicago Cubs baseball team. The theater both has performances of, and teaches improvisational comedy. It was founded in the 1980s by Del Close and Charna Halpern...
  
  , "in illo ordine", Latin phrase meaning "respectively" ("in that order")
• Industrial organization
  Industrial organization
  Industrial organization is the field of economics that builds on the theory of the firm in examining the structure of, and boundaries between, firms and markets....
  
  , the field of economics that studies the strategic behavior of firms, the structure of markets and their interactions
• Industrial and Organizational Psychology
  Industrial and organizational psychology
  Industrial and organizational psychology is the scientific study of employees, workplaces, and organizations. Industrial and organizational psychologists contribute to an organization's success by improving the performance and well-being of its people...
  
  , the field of psychology that studies work, academic, and other organizational issues
• Input/output
  Input/output
  In computing, input/output, or I/O, refers to the communication between an information processing system , and the outside world, possibly a human, or another information processing system. Inputs are the signals or data received by the system, and outputs are the signals or data sent from it...
  
  , the collection of interfaces that different functional units of an information processing system use to communicate with each other
• Image orthicon tube, a TV camera used between 1946 and 1968
• International Operations
  International Operations
  International Operations is a fictional American Intelligence Agency in Wildstorm comics. I.O. first appeared in WildC.A.T.S. volume 1 #1 and was created by Brandon Choi and Jim Lee.-International Operations:...
  
  , a fictional American Intelligence Agency in Wildstorm comics
• International Organization
  International Organization
  International Organization is a peer-reviewed academic journal that covers the entire field of international affairs. Subject areas include: foreign policies, international relations, international and comparative political economy, security policies, environmental disputes and resolutions,...
  
  , a peer-reviewed journal that covers the entire field of international affairs
• Intraosseous infusion
  Intraosseous infusion
  Intraosseous infusion is the process of injection directly into the marrow of a bone. This technique is used in emergency situations to provide fluids and medication when intravenous access is not available or not feasible.-History:...
  
  , the medical process of introducing medication directly into the bone marrow
• IO Interactive
  IO Interactive
  IO Interactive is a Danish video game development company currently owned by Square Enix. The company was founded in September 1998 by the Reto-Moto development group. To date their most popular franchise is the critically acclaimed Hitman series...
  
  , a Danish computer game developer
• iO Digital Cable Service, a service offered by Cablevision
• Investigating Officer, a police officer in the United Kingdom who heads an investigation, usually from CID but of any rank
• Interest-only, a type of collateralized mortgage obligation
  Collateralized mortgage obligation
  A collateralized mortgage obligation is a type of financial debt vehicle that was first created in 1983 by the investment banks Salomon Brothers and First Boston for U.S. mortgage lender Freddie Mac. A collateralized mortgage obligation (CMO) is a type of financial debt vehicle that was first...
  
   (CMO) or mortgage-backed security
  Mortgage-backed security
  A mortgage-backed security is an asset-backed security that represents a claim on the cash flows from mortgage loans through a process known as securitization.-Securitization:...
  
  
• Integrated operations
  Integrated operations
  In the Petroleum industry, Integrated operations refers to new work processes and ways of doing oil and gas exploration and production, which has been facilitated by new information and communication technology. Multi-discipline collaboration in plant operation is one example...
  
  , 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
• Inventory objective or Insertion order, a business document specifying the inventory goal of an advertising campaign

A code

• Indonesian Airlines
  Indonesian Airlines
  Indonesian Airlines 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 Indonesian Airlines, to give restructuring opportunities to the operators.-Code data:*IATA Code:...
  
  ' IATA airline designator
• .io
  .io
  .io is the Internet country code top-level domain for the British Indian Ocean Territory.Internationalized domain names may also be registered ....
  
  , the Internet country code top-level domain (ccTLD) for the British Indian Ocean Territory, or, more specificallly, the British Indian Ocean Territory's ISO 3166-1 alpha-2 country code and DAFIF 0413 / DIA 65-18 / FIPS PUB 10-4 territory code
• The two-letter ISO 639-1
  ISO 639-1
  ISO 639-1:2002, Codes for the representation of names of languages — Part 1: Alpha-2 code, is the first part of the ISO 639 series of international standards for language codes. Part 1 covers the registration of two-letter codes. There are 136 two-letter codes registered...
  
   language code for Ido
  Ido
  Ido is a constructed language created with the goal of becoming a universal second language for speakers of different linguistic backgrounds as a language easier to learn than ethnic languages...
  
  , a constructed language

In biology

• Io (genus), a genus of freshwater snail in the family Pleuroceridae
• Automeris io
  Automeris io
  The Io Moth is a very colorful North American moth in the Saturniidae family. It ranges from the southeast corner of Manitoba and in the southern extremes of Ontario, Quebec, and New Brunswick in Canada, and in the US it is found from Montana, North Dakota, South Dakota, Nebraska, Colorado, New...
  
  , a moth species in North America
• The Hawaiian Hawk
  Hawaiian Hawk
  The Hawaiian Hawk or Io, Buteo solitarius, is a raptor of the Buteo genus endemic to Hawaii. Buteos tend to be easily recognized by their bulky bodies relative to their overall length and wingspan. The Io is the only hawk that is native to Hawaii, and fossil evidence indicates that it inhabited...
  
  's local name
• Inachis io
  Inachis io
  The European Peacock , more commonly known simply as the Peacock butterfly, is a colourful butterfly, found in Europe, temperate Asia as far east as Japan. It is the only member of the genus Inachis...
  
  , the European Peacock butterfly

In computing

• Io (programming language)
  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 instance and class. Like Smalltalk, everything is an object and...
  
  , a pure object-oriented programming language
• The IO.SYS
  IO.SYS
  IO.SYS is an essential part of MS-DOS and Windows 9x. It contains the default MS-DOS device drivers and the DOS initialization program.- Boot sequence :...
  
   file in DOS and Windows 95, 98 and ME
• I/O, abbreviation for input/output
  Input/output
  In computing, input/output, or I/O, refers to the communication between an information processing system , and the outside world, possibly a human, or another information processing system. Inputs are the signals or data received by the system, and outputs are the signals or data sent from it...
  
  

In history

• Io (voievodal title particle)
  Io (voievodal title particle)
  Io is a particle of a title used mainly by Romanian royalty from both Moldavia and Walachia, preceding their names and the complete list of titles, in all their documents , since the formation of the respective principalities up to the Hohenzollern dynasty in the 19th century.First used by the...
  
  , a particle of a title used by Romanian royalty from Moldavia and Walachia

In literature

• Io (mythology)
  Io (mythology)
  Io was, in Greek mythology, a priestess of Hera in Argos, a nymph who was seduced by Zeus, who changed her into a heifer to escape detection. His wife Hera set ever-watchful Argus Panoptes to guard her, but Hermes was sent to distract the guardian and slay him...
  
  , daughter of Inachus in Greek mythology, and lover of Zeus
  Zeus
  In the ancient Greek religion, Zeus was the "Father of Gods and men" who ruled the Olympians of Mount Olympus as a father ruled the family. He was the god of sky and thunder in Greek mythology. His Roman counterpart is Jupiter and his Etruscan counterpart is Tinia.Zeus was the child of Cronus...
  
  
• Io, an alternate spelling of the nereid Ino
  Ino (Greek mythology)
  In Greek mythology Ino was a mortal queen of Thebes, who after her death and transfiguration was worshiped as a goddess under her epithet Leucothea, the "white goddess." Alcman called her "Queen of the Sea" , which, if not hyperbole, would make her a doublet of Amphitrite.In her mortal self, Ino,...
  
  , later known as Leukothea who in the Odyssey gave Odysseus
  Odysseus
  Odysseus or Ulysses was a legendary Greek king of Ithaca and the hero of Homer's epic poem the Odyssey. Odysseus also plays a key role in Homer's Iliad and other works in the Epic Cycle....
  
   a veil that allowed him to breathe underwater.
• Io, an unfinished actes de ballet of Jean-Philippe Rameau
  Jean-Philippe Rameau
  Jean-Philippe Rameau was one of the most important French composers and music theorists of the Baroque era. He replaced Jean-Baptiste Lully as the dominant composer of French opera and is also considered the leading French composer for the harpsichord of his time, alongside François...
  
  
• Io Matua Kore
  Io Matua Kore
  Io Matua Kore is in many ancient Polynesian traditions the supreme god....
  
  , in some Māori traditions the supreme god

In modern fiction

• Blind Io, the current king of the gods in Terry Pratchett's Discworld series of fantasy novels
• Io (Dungeons & Dragons)
  Io (Dungeons & Dragons)
  In many campaign settings for the Dungeons & Dragons roleplaying game, Io is the chief deity worshipped by dragons, god of dragonkind, balance, and peace. He is seen by his people as the creator of all things. He is neutral in alignment, but he also contains within him all other alignments...
  
  , the chief deity worshipped by dragons in the Dungeons & Dragons role-playing game
• 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

In popular culture

• Io (arcade game) - a C64
  Commodore 64
  The Commodore 64 is an 8-bit home computer introduced by Commodore International in January 1982.Volume production started in the spring of 1982, with machines being released on to the market in August at a price of US$595...
  
   arcade game published in 1988.
• IO (band)
  IO (band)
  IO is a German alternative rock band, formed in 2006 after the breakup of Guano Apes. Original Guano Apes members Henning Rümenapp , Stefan Ude and Dennis Poschwatta reunited after having spent time on individual projects - of which Poschwatta's band Tamoto was the only real band, as well as the...
  
  , a German band
• Io (English band)
  Io (English Band)
  io is an experimental rock band from Birmingham, UK. The band currently consists of Al Lawson , Stu Atkins , Dave Wright , and Steve Wood ....
  
  , an English band
• iO, a Chicago improvisational comedy theater formerly known as ImprovOlympic
• IO (2011 Webseries), Flinders University project by David Tang
  David Tang
  Sir David Tang, KBE is a Hong Kong businessman and socialite best known as the founder of the Shanghai Tang fashion chain, which he sold in 2006 to Richemont.Tang's grandfather "founded the Kowloon bus company and became one of Hong Kong’s greatest philanthropists"...
  
   and Michael Tessari

See also

• Ю or yu, a Cyrillic letter
• I/O (disambiguation)
• IOS (disambiguation)