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2. Vision panel - Wikipedia

   en.wikipedia.org/wiki/Vision_panel

   A vision panel is a small window in a door which allows people to look through without opening the door. Vision panels are sometimes in walls, generally adjacent to a door. These have implications in safety, primarily to avoid opening doors on a person coming the other way, but also in case of fire to avoid opening a door onto a fire.

3. Leadlight - Wikipedia

   en.wikipedia.org/wiki/Leadlight

   Doors were often surmounted by decorative fanlights in which the panes of glass might be supported by lead, but wood was also commonly used as the support for the glass in fanlights. Casement windows and fixed windows continued to employ leadlight, often with larger panes of rectangular rather than diamond shape.

4. Plate glass - Wikipedia

   en.wikipedia.org/wiki/Plate_glass

   Plate glass is often used in windows. Fragment of a Roman window glass plate dated to 1st to 4th century CE. Plate glass, flat glass or sheet glass is a type of glass, initially produced in plane form, commonly used for windows, glass doors, transparent walls, and windscreens. For modern architectural and automotive applications, the flat glass ...

5. Muntin - Wikipedia

   en.wikipedia.org/wiki/Muntin

   Diagonal muntins separating diamond-shaped panes of glass in a casement window. Muntins divide each window into six panes of glass. Rounded mullions separate the three casement windows. Nový Bor, the Czech Republic. A muntin (US), muntin bar, glazing bar (UK), or sash bar is a strip of wood or metal separating and holding panes of glass in a ...

6. Insulated glazing - Wikipedia

   en.wikipedia.org/wiki/Insulated_glazing

   The glass panes are separated by a "spacer". A spacer, which may be of the warm edge type, is the piece that separates the two panes of glass in an insulating glass system, and seals the gas space between them. The first spacers were made primarily of steel and aluminum, which manufacturers thought provided more durability, and their lower ...

7. Window - Wikipedia

   en.wikipedia.org/wiki/Window

   Light, or Lite, is the area between the outer parts of a window (transom, sill and jambs), usually filled with a glass pane. Multiple panes are divided by mullions when load-bearing, muntins when not. [27] Lattice light is a compound window pane madeup of small pieces of glass held together in a lattice. Fixed window is a unit of one non-moving ...