Idea of Additional Icon
The icon is very simply composed of an empty circle with a large, upper case letter A in the center, about as wide as the circle's radius. The icon stands for the presence of additional elements outside of the ones currently being represented on the screen.
Additional and other 101,200 icons from Icons8 icon pack
follow the visual guidelines of the operating systems: Windows
, Android Material
, and more. All PNG icons and most SVG icons are free (or you can buy all icons