**Examples of rectangular prisms include a solid brick, a regular box, a rectangular cabinet, a six-sided die or a Rubik's cube.** A rectangular prism, also called a rectangular cuboid, is a three-dimensional solid object that has six of its faces in the shape of a rectangle.

The rectangular prism is a special type of cuboid called a convex polyhedron, which is characterized by having six flat quadrilateral faces. Its label "prism" is due to its characteristic of having a consistent cross-section across one of its faces. This feature lends itself to the concept that the opposite faces of a rectangular prism are congruent or equal. Another characteristic of the rectangular prism is that all angles in its corners are 90 degrees in measurement.

Special cases of the rectangular prism include the square cuboid, wherein at least two faces of the solid are square-shaped. Still another special case is the cube, all the faces of which are square.

Rectangular prisms may also appear as spaces instead of solid objects. In the case of a box-type room, the space inside the room is bound by the ceiling, the floor and four walls, which are six rectangular faces that surround the rectangular prism space.