Pyramidal numbers are created by stacking objects in the shape of a pyramid. They are also known as tetrahedral numbers, as they can be represented by a regular tetrahedron. Alternately, they can also be referred to as triangular pyramidal numbers, reflecting their triangular shape when viewed from a certain angle. Pyramidal numbers are also used in the study of combinatorics, and as such, they may also be known as combinatorial numbers. Some other terms that can be used to refer to pyramidal numbers include 3D numbers, pyramid numbers, and triangular numbers raised to the third power. Ultimately, regardless of the term used, pyramidal numbers retain their distinctive shape and mathematical significance.