Idea of Invert Selection Icon
It is a square with a circle inside it. The square has a diagonal line from the bottom-left corner to the top-right corner that splits the square and circle into two triangles with half-circles inside them. The top-left triangle is filled with dots outside of the half-circle, whereas the bottom-right triangle is only filled with dots inside the half-circle.
This is a Invert Selection icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,900 icons, all in the same style and quality.