This is the Książka adresowa 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.
This is a simple icon meant to represent an address book. It's a rectangle stood on end with rounded corners and the @ sign in the middle. The right hand side of the book is hatched with short lines to represent the rings that hold the pages inside the binder.