Final answer:
The block of material used to create a print in relief printing is called a matrix.
Step-by-step explanation:
The block of material that can be used to create a print in relief printing is called a matrix. It can be made of metal, wood, stone, or other materials. In relief printing, the areas of the matrix that are meant to show the printed image are left on the original surface, while the rest is cut away. Ink is then applied to the surface of the matrix and transferred onto paper.