It's a logo of Spiral Bulb reduced to a bulb with a spiral light. This light bulb is like a normal bulb except the bulb part is a spiral instead.
This Spiral Bulb 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 15,800 icons, all in the same style and quality.