It's a drawing of a computer monitor or T.V. with a double ended arrow drawn inside of the screen. The arrow is pointing to the top right of the screen and to the bottom left of the screen as if to indicated the diagonal size of the screen.
This is a Widescreen icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,300 icons, all in the same style and quality.