Io, IO, I/O, i/o, or i.o. may refer to:
Iowa (/ˈaɪ.oʊwə/) is a U.S. state in the Midwestern United States, bordered by the Mississippi River on the east and the Missouri River and the Big Sioux River on the west.
iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware.
iOS jailbreaking is the process of removing software restrictions imposed by Apple's on iOS and tvOS. It does this by using a series of software exploits.
iOS is a mobile operating system, developed by Apple Inc. for iPhone, iPad, and iPod touch. Updates for iOS are released through the iTunes software, and, since iOS 5, via over-the-air software updates.
Ion Television is an American broadcast, cable, and satellite television network that is owned by Ion Media Networks.
Iowa State University of Science and Technology is a public flagship land-grant and space-grant research university located in Ames, Iowa, United States.
An ion thruster is a form of electric propulsion used for spacecraft propulsion. It creates thrust by accelerating ions with electricity.