iMac and other 68,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
This logo is a computer monitor. There is a rounded rectangle longer horizontally than vertically, with a line in the lower quarter of the rectangle. In this lower quarter, there is a single centered dot. Protruding from the center of the bottom is a base that is shaped like a bell.