What does iOS mean

iOS= iPhone/iPod/iPad Operating System.

-ThatGuy

The "i" was first used by Apple for the iMac - to market it as Internet ready, so general assumption is that "i" originally stood for Internet. Starting with the iPod it became just a standard way to name many Apple devices.

http://lmgtfy.com/?q=what+does+ios+mean

Operating System for iDevices (iPad, iPhone, iPod Touch)

Stedman