This is a Bureau 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 12,800 icons, all in the same style and quality.
This looks like three rectangles on top of each other. The very top one is smaller and longer. The two bottom ones have a line in the center of them, going horizontal. There are two tiny squares on the bottom of the bottom rectangle, on the edges.
Related to Bureau Filled Icon
Related icons are the icons with matching tags, as well as all household icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors