A window glazing bar, also known as a muntin, is a strip of wood, metal, or vinyl that divides a single windowpane into multiple smaller panes.

Glazing bars are typically used for aesthetic reasons, as they can create a traditional or historical look for a building.

In addition, they can also help support larger panes of glass, which might otherwise be more prone to breakage or damage.

Glazing bars may be fixed or removable, and can be configured in a variety of patterns and styles, depending on the desired look and function of the window.