This is a System Task 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 12,700 icons, all in the same style and quality.
There is a square computer monitor included a stand at the bottom. The monitor has a circular power button on the bottom right part of the square frame. On the screen part is a line similar to an EKG line going across horizontally, moving up then down then leveling out near the end on the right.