It's an icon of a computer screen that has been reduced to a small version of a computer monitor. It is a rectangle with hard corners sitting on a flat rectangle with a little rectangle in the center. Inside the bigger rectangle appears to be a three dimensional box.
This is the Switch Host 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.