Hexagonal or dodecagonal. Because the blade of the silicon rod cutter is hexagonal or dodecagonal, the cut silicon rod also presents the corresponding shape. After processing, the cut silicon rod has a rough section and a non-smooth surface, which needs polishing or chemical polishing. Single crystal silicon rod is shaped or drawn in the furnace by zone melting or Czochralski method, which is a single crystal silicon rod with silicon atoms rearranged according to the crystal lattice arrangement direction of seed crystal.