This is the User Manual 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 icon for User Manual looks like an open book. The cover of the book looks like a rectangle with rounded edges, and two pages are visible, separated by a line in the middle of the pages. On the page on the right, there is a large lower case letter i.