For which feature is a Gothic uppercase "D" shaped notably?

The Gothic uppercase "D" is characterized by its distinctly rounded bottom, which contributes to the overall elegance and fluidity associated with Gothic lettering. This rounded contour is a defining feature that contrasts with the sharp lines and angular shapes often found in other styles of calligraphy. The soft curve enhances the readability and aesthetic appeal, making it a notable aspect of this letterform within the Gothic typeface tradition.

The other features listed do not accurately represent the shape of a Gothic uppercase "D." While variations in Gothic fonts might present different stylistic elements, the signature roundness at the bottom remains a primary characteristic that helps to distinguish it within the genre.