- A parallelepiped is a polyhedron with six faces that are parallel in pairs.
- A right parallelepiped is a parallelepiped whose lateral edges are perpendicular to the bases. A parallelepiped whose lateral edges are not perpendicular to its bases is an oblique parallelepiped.
- If all the faces of a parallelepiped are rectangles, then it is a right rectangular prism.
The volume V of a parallelepiped is \(V=A\times h\), where A is the area of one of the faces and h is the height relative to the base.