This Countdown Clock 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 15,300 icons, all in the same style and quality.
It's the image of a clock face with the number "12" written in the center. Around the clock face are the dots where the numbers of a clock would go. The circle that encloses the clock face is actually a circular arrow drawn around the clock. The arrow is pointing counter clockwise to indicate time going backwards twelve hours.