A springline Gothic fixed window is a type of window with a pointed arch at the top, which is also known as a "Gothic" arch. The arch has a lower curve known as the "springline," which is flatter and wider than a traditional arch. The window is fixed in place and cannot be opened or closed.

From an architectural standpoint, the springline Gothic shape of the window provides a unique and interesting design element that can enhance the aesthetic quality of a building. The fixed design of the window provides insulation and soundproofing properties to the building while allowing natural light to enter. Overall, a springline Gothic fixed window can be a stylish and modern addition to a building's design.