This is a Wolfram Alpha Filled icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 12,600 icons, all in the same style and quality.
We've received the idea on April 16, 2012 and created the icons on May 20, 2012
Popular Software Icons: VLC, Wolfram Alpha, etc
Popular software doesn't get much icon support, but it needs it to be part of the unified consistent look, pick popular specific software with simplistic but unique vector styles for the icons