Idea of Sort By Recently Viewed Icon
It's a logo of a icon in order to sort by recently viewed. It has an eye placed on the inside of an open top square. Underneath the eye is an arrow pointing down.
This Sort By Recently Viewed icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,100 icons, all in the same style and quality.