It is a speech bubble square with rounded corners. Inside of it are 2 triangular mountains (one slightly larger and in the foreground) and a circular sun, somewhat like a stereotypical landscape photo.
This MMS icon is a responsive icon. This means that it's optimized for four resolutions, from tiny 16x16 until highly detailed 80x80. The style comes from the latest Microsoft Office
, which makes it perfect for any Windows applications, in particular, those with ribbon toolbar control. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 15,700 icons, all in the same style and quality.