text: A point symmetry operation is a symmetry operation f for which at least one point p has the property p = f(p). 
  Table 1. Point symmetry operations in three dimensions.
  a R stands for a number ≥ 1.
  b The Schoenflies system uses rotoreflections (given the symbol S) instead of rotoinversions. For each rotoinversion operation, there is an equivalent rotoreflection; examples of how these operations match up are : –3 = S ; –4 = S ; –6 = S .