Final answer:
The deffufa is the unique type of Nubian mud-brick architecture used in ancient religious structures, exemplified by the Western Deffufa in the city of Kerma.
Step-by-step explanation:
The unique type of Nubian architecture that was made from mud bricks and used for religious structures is known as a deffufa. In the ancient city of Kerma, the Western Deffufa stands out as an impressive landmark of this architectural style.
This three-story temple reaches nearly sixty feet in height and served as a center for religious ceremonies. The architectural significance of the deffufa is highlighted by its distinctiveness to the Nubian region, with only three such structures known to exist today.