The logo of the ios operating system. the number 7 on a green backgroundThe logo of the iOS operating system. The number 7 on a green background
Windows 8 shopping cart with the operating system insideWindows 8 shopping cart with the operating system inside
Three-dimensional logo of the windows operating systemThree-dimensional logo of the windows operating system
Colored squares logo of the computer operating systemColored squares logo of the computer operating system
Night operation on may 17, 1943 at the dam art drawingNight operation on May 17, 1943 at the dam art drawing