For strength of brick constructions it is useful to have them partially overlapping. A rectangular shape makes it easier to have them partly overlapping.
A rectangular prism.
the opposite two sides can be a square or a rectangle.the rest 4 sides are rectangular
he most common shape is a rectangular prism.
a rectangle in 3D A brick shape.
A rectangular prism (like a brick).
A brick, book, dresser or shelf, a toy chest or a rectangular box.
A brick, book, dresser or shelf, a toy chest or a rectangular box. Rectangular prisms are everywhere.
A square.
A rectangular square
It is a solid shape with two identical and parallel rectangles as bases and four rectangular faces connecting them together. A smoothed brick is an example of a rectangular prism.
Nepal
square