Related icons are the icons with matching tags, as well as all files icons
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Idea of FFF Icon
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".
FFF and other 93,200 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px.