FAQ and other 85,000 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. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
The icon FAQ is two squares on top of each other with the top one off to the right. The top square has a capital "A" in the middle and a small point on the bottom right corner that extends past the edge. The bottom square has a capital "Q" with a point that extends past the edge on the bottom left corner.