Key Terms The following key terms were used in this lesson: Grids Grids Vertical reference planes that help divide the plan view of a model. Levels Levels User-defined horizontal reference planes, defined by their level, that help divide the elevation views of a model. They typically match the floor elevations of buildings. Section Views Section Views Elevation views that show some cross section of a building design. Graphic Overrides Graphic Overrides Customs graphic settings for color, line, transparency, and other attributes that will take precedence over the default settings. Tweet Continue Reading