user interface

The user interface, or UI, of a device is the look and feel of the on-screen menu system. How it works, its color scheme, how it responds to button presses, all of these things are part of the user interface. The term is also sometimes used to refer to the piece of software that resides on a smartphone that deals with typical user interface issues. For example, UIQ and Nokia S60 are both user interfaces that run on the Symbian OS on smartphones. They each have a very different look and feel to them.
Also known as: "UI"

UIQ
UMA

Mobile Tech Glossary