Which of the following elements is NOT considered an annotation element in Revit?

In Revit, annotation elements serve the purpose of providing additional information about the building's design without being part of the physical model itself. Items classified as annotation include tags, which identify and provide information about other elements; dimensions, which give measurements and alignments; and details, which clarify certain aspects of the design or construction method.

3D modeling, on the other hand, involves creating and manipulating the actual geometric representation of the building elements such as walls, floors, roofs, and other components that make up the model. It contributes directly to the spatial and structural aspects of the design rather than just providing supplementary information.

Thus, while tags, dimensions, and details all enhance the understanding and documentation of the design, 3D modeling relates to the physical structure within the model, making it the element that does not belong in the annotation category.