Definitions for "Close button"
Keywords:  button, corner, unsaved, click, bar
the small button with an X in it which appears at the right hand end of the title bar in recent versions of Windows and OS/2.
The small button on a window's Title bar which, when clicked, closes the window.
A close button is normally found in the top right hand corner of a window or graphical user interface. A close button is normally a square with an 'x' inside it.