A sash window or hung sash window is made of one or more movable panels or sashes that form a frame to hold panes of coloured glass, which are often separated from other panels by glazing bars.
The city of Tabriz is famous for making such windows. Although any window with this style of glazing is technically a sash, the term is used almost exclusively to refer to windows where the glazed panels are opened by sliding vertically, or horizontally. Unfortunately, these windows, known in Iran as Orosi, are currently less used in the interior and exterior architecture of the buildings.
Here are IRNA’s photos of Orosi art in Tabriz:
