(1) For elements that can slope (including roofs, ramps, floors, and ceilings), the upper end of the slope. For example, in the following illustration, the ______ is the upper end of the sloped floor. (2) In Revit Architecture, the symbol that displays in a drawing to represent a component, such as a section, callout, elevation, grid, or level. For example, in a floor plan, you can double-click a section ______ to go to the section view. (In the following floor plan, the blue symbol is a section ______.) (3) For windows and doors, the piece that goes across the top of the window or door to create the rough opening.