Matrix groups consist of matrices together with matrix multiplication. The general linear group G L ( n , R ) consists of all invertible ⁠ n ⁠ -by- ⁠ n ⁠ matrices with real entries. Its subgroups are referred to as matrix groups or linear groups. The dihedral group example mentioned above can be viewed as a (very small) matrix group. Another important matrix group is the special orthogonal group ⁠ S O ( n ) ⁠. It describes all possible rotations in n dimensions. Rotation matrices in this group are used in computer graphics.