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-Dimensional (3D) Tactics Analysis traditional 'fog of war'. 3D tactical analysis has been strongly influenced by fire fighters in the UK and U.S. They have developed the most coherent concept of 3D tactics called '3D fire fighting methodology'. More recently, 3D Tactics Analysis the concept has been included into the realm of Fifth Dimensional Operations. Three-Dimensional (3D) Tactics Analysis Three-Dimensional (3D) Tactics Analysis, is a tactical analysis methodology under the concept of Terrorist Tactics, Techniques, and Procedures, and is related to Rhizome Manoeuvre. The approach is applicable to urban combat, and takes into account mass gatherings of people located in highly complex urban structures,