Idea of Hashtag Activity Grid Icon
There is a square that has been divided into 4 columns and 4 rows. in the lower right hand corner the square is wited out so se can not see it and the pound sign is in the whited out area
This page contains the Hashtag Activity Grid vector icon, as well as variations of this icon in different visual styles, and related icons. All icons are in the flat vector style, however, differ by the line thickness, fill, and corner radius.