Mullions are vertical or horizontal elements that divide a window or door. Common synonyms for mullions include window bars or grills, frames, sashes, and panels. Additionally, mullions can be referred to as casings, dividers, or glazing bars. Mullions are often found in traditional architecture, but they can be adapted to contemporary styles. When selecting a synonym for mullions, it is important to consider the type of structure where they will be used and the design intent. Regardless, mullions serve to enhance the beauty and functionality of windows and doors, while adding character and depth to a building's facade.