It's a logo of a piece of paper with the top right corner folded over to make a triangle shape on the upper right area. Inside are three prominent letter "F"s or in other words "FFF".
This FFF icon is made in flat color style
. This format was developed by Icons8 designer team and became immensely popular for use in web and mobile applications. Feel free to download this icon in PNG format for free, or unlock other formats for $5. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 5,900 icons, all in the same style and quality.