Io

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

Iowa ( ( listen)) is a U.S. state in the Midwestern United States, bordered by the Mississippi River to the east and the Missouri and Big Sioux rivers to the west.

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

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 purpose of removing software restrictions imposed by Apple on iOS, tvOS and watchOS.

An ion () is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons).

iOS 11 is the eleventh major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 10. It was announced at the company's Worldwide Developers Conference on June 5, 2017, and released on September 19, 2017.

Ion Television is an American broadcast, cable, and satellite television network that is owned by Ion Media.

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