Io

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

iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware.

Iowa () 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 11 is the current eleventh major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 10. It was announced and the first beta version released to developers at the company's Worldwide Developers Conference on June 5, 2017, with a public beta released in late June, and a stable version for consumers was released in most countries on September 19, 2017. Some countries got the update on September 20, 2017.

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.

iOS jailbreaking is privilege escalation for the process of removing software restrictions imposed by Apple on iOS and tvOS.

iOS 10 is the tenth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 9. It was announced at the company's Worldwide Developers Conference on June 13, 2016, and was released on September 13, 2016. It was succeeded by iOS 11 on September 19, 2017.

Iowa State University of Science and Technology, often referred to as Iowa State, is a public flagship land-grant and space-grant research university located in Ames, Iowa, United States.

Io (Jupiter I) is the innermost of the four Galilean moons of the planet Jupiter. It is the fourth-largest moon, has the highest density of all the moons, and has the least amount of water of any known astronomical object in the Solar System.