This Navigation Toolbar Bottom 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 15,600 icons, all in the same style and quality.
The icon is shaped like a rectangle with round edges. About a third of the way down there is a horizontal line running through it. In between the horizontal line and the base of the rectangle are two small circles followed by a long skinny rectangle.