The icon is a picture of the logo for Field. The icon is what appears to be a farmers field. The icon also has a sun at the top left. The icon has several lines on it, implying that it is a field for crops.
This page contains the Field 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.