A rounded rectangle, screen or computer window with a bar chart and a star on its corner.

Chart Window With A star

A window or postcard in the shape of a rounded horizontal rectangle, depicting three mountains and some clouds.

Window Or Postcard With Mountains

Two overlapped rounded rectangles or pop-up windows with many different-sized scattered rectangles.

An outlined rectangle or a window frame. 

A vertical computer window or pop-up with elements such as a rectangle or image and text.

A vertical rectangle window frame with a crossed frame in the middle and a blank view.

A rectangular, horizontal website window showing two rectangle shapes overlapping.