Hi,
**What does "RT" stand for?**As with Windows NT, Microsoft has yet to clarify what "RT" actually means. Why on Earth Microsoft decided to name the ARM-powered version of Windows so ridiculously similar to the abbreviation for Windows Runtime, WinRT, is beyond the abilities of mere mortals to decipher.
Windows RT is simply a name that Microsoft has given to Windows 8 on ARM. You wouldn't be entirely off base to think of it as "Windows Lite," given its restrictions and differences from standard Windows 8, which runs both Metro and Desktop modes.
http://reviews.cnet.com/8301-33642_7-57454524-292/just-what-is-windows-rt-anyway-faq/