The symbol "0" in glazing terminology represents which of the following?

In glazing terminology, the symbol "0" signifies a fixed panel. A fixed panel is a component of a window system that is designed to remain stationary and does not open or close. This type of panel is typically used to provide unobstructed views and natural light while maintaining energy efficiency as it doesn't have operational hardware that can cause air or water infiltration.

Fixed panels are essential in various glazing systems as they can serve as large vision areas, creating aesthetic appeal and enhancing the overall design of a building. Understanding the designation of each symbol in glazing helps contractors and design professionals efficiently communicate and specify the types of windows and doors in their plans.