A cantilevered window, also known as an ORIEL window, is a type of window that projects outward from the main walls of a building. It is supported by a bracket or corbel and does not have any external supports. The term 'CANTILEVER' refers to the way the window is constructed, with the weight of the window being supported by the wall below. ORIEL windows are often used to add architectural interest to a building, as well as providing additional light and ventilation.