This is a Square 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 13,300 icons, all in the same style and quality.
Idea of Square Filled Icon by Michał Narwojsz
We've received the idea on July 7, 2012 and created the icons on July 30, 2012
I need icons for image editing application: crop image, draw a line, draw ellipse, draw rectangle, draw arrow, add text to image, take a screenshot