Io

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

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

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

Ionizing radiation (ionising radiation) is radiation that carries sufficient energy to detach electrons from atoms or molecules, thereby ionizing them.

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 the privilege escalation of a iDevice for the purpose of removing software restrictions imposed by Apple on iOS, tvOS and watchOS operating systems.

Iowa State University of Science and Technology (Iowa State) is a flagship public land-grant and space-grant research university in Ames, Iowa.