Idea of Spread Icon
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.
This is the Spread icon for Windows 10
. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.