The above figure is called a cube or a regular hexahedron.
A cube is one of the 5 platonic solids.
Lines ac = cd = db = ab and are called edges.
Each "corner" of a cube (points a, b, c and d for example) is called a vertex.
Each plane of a cube is a square (plane a b c d for example) and is called a face.
Every cube has 6 faces, 8 vertices and 12 edges.
Dice are good examples of cubes.
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