This is a Select All 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.
This image depicts a textual document that is relatively filled with writing. The entire square is bordered by a dotted line. It appears to contain the entirety of the document, as opposed to just the lines that are currently visible.
Related to Select All Icon
Related icons are the icons with matching tags, as well as all editing icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors