between two 2-fold axes perpendicular to the principal axis, it is designated as a dihedral mirror plane, which is indicated by a subscript .

Through the reflection of each mirror plane, the molecule must be able to produce an identical image of itself.

Inversion operation

In an inversion through a centre of symmetry, (the element), we imagine taking each point in a molecule and then moving it out the same distance on the other side. In summary, the inversion operation projects each atom through the centre of inversion

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