This icon is simply the letter "O" centered inside a square shape. The square shape enclosing the "O" has rounded corners. The width of the letter is approximately one third the width of the square.
This is the Oxygen 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.