Final answer:
The row of command buttons at the top of the drawing window in Revit is called Ribbon. It provides quick access to frequently used tools and functions in Revit.
Step-by-step explanation:
The row of command buttons at the top of the drawing window in Revit is called Ribbon. The Ribbon is a graphical interface element that consists of a series of tabs, each containing various commands organized in groups. It provides quick access to frequently used tools and functions in Revit.