Point groups in three dimensions the finite subgroups of SO(3), are: the cyclic groups "C" (the rotation group of a canonical pyramid), the dihedral groups "D" (the rotation group of a uniform prism, or canonical bipyramid), and the rotation groups "T", "O" and "I" of a regular tetrahedron, octahedron/cube and icosahedron/dodecahedron. In particular, the dihedral groups "D", "D" etc. are the rotation groups of plane regular polygons embedded in three-dimensional space, and such a figure may be considered as a degenerate regular prism. Therefore, it is also called a "dihedron" (Greek: solid with two faces), which explains the name "dihedral group". The rotation group of
Three Faces West Three Faces West Three Faces West is a 1940 American drama film directed by Bernard Vorhaus and starring John Wayne, Sigrid Gurie and Charles Coburn. Two refugees, a medical doctor and his 20-something-year-old daughter arrive in the USA from Nazi-annexed Austria end up in becoming the much-needed physician and nurse in a small North Dakota farm town. The local town located in the area known as the Dust Bowl and is being hard hit by the drought and dust storms. The local farmers and townspeople want to try to save their farms and the town by adopting newer farming methods,