 A regular real 1-dimensional polytope is represented by an empty Schläfli symbol {}, or Coxeter-Dynkin diagram .The dot or node of the Coxeter-Dynkin diagram itself represents a reflection generator while the circle around the node means the generator point is not on the reflection, so its reflective image is a distinct point from itself.By extension, a regular complex 1-dimensional polytope in formula_1 has Coxeter-Dynkin diagram , for any positive integer "p", 2 or greater, containing "p" vertices.