This is a List of Thumbnails 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.
It's a logo of six square pictures arranged three on each side in two columns. To the right of each picture is a dash. The pictures are mountain, sun and flower on the left from top to bottom, and flower, cloud, mountain on the right from top to bottom.