This Gest rozszerz icon is made in Material Design style developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 4,300 icons, all in the same style and quality.
Consider a circle to which an arrow mark is attached. There will be two circles separated by some distance to for which one arrow is towards the north-east direction and other is towards exactly opposite to it on the adjacent circle pointing towards south west direction. These two circles lie on an imaginary line which is at 45 degrees to the horizontal.