What term describes a cemetery monument in which the die is taller than it is wide?

The term that best describes a cemetery monument in which the die is taller than it is wide is "Vertical Tablet." This type of monument typically has a rectangular or tablet shape that is extended in height more so than in width, making it visually distinct in a cemetery setting. The vertical orientation often allows for inscriptions and designs that can be viewed easily from a distance, which is a characteristic feature of this style of monument.

While other terms like "monolith," "gravestone," and "obelisk" may also describe different forms of memorialization, they do not specifically capture the aspect of having a die that is taller than it is wide in the same way that "Vertical Tablet" does. Monoliths refer to large stone structures, gravestones can vary widely in shape and size, and obelisks are typically tall, four-sided monuments with a square or rectangular base that tapers to a point at the top. Therefore, the precision of the term "Vertical Tablet" aligns perfectly with the description given in the question, making it the most accurate choice.