QT

1. A GUI software toolkit developed by Trolltech, formerly known as Quasar Technologies. It includes a C++ class library and tools for cross-platform development and internationalization.
   
   The official Qt website can be found here: http://trolltech.com/products/qt
    
2. Abbreviation for Quick Time.
3. Shorthand for quit talking, QT is used in chat and other text-based communication to tell another user to stop talking.
4. Chat slang for cute or cutie, QT is also used in chat and other text-based communication as a way of telling another user they're cute.

Also see: Chat definitions, Programming definitions, QFT