Symmetry in a flag
The figure in the flag of Hong Kong doesn't have any symmetry axes (as we can easily verify with a mirror), but presents a cyclic symmetry of type C5. If we consider also the red rectangle where the figure is inscribed, the symmetry of the flag is cyclic of type C1: there is no rotation that sends the flag in itself, apart from the identity.
The image belongs to the sections...:
1. (C1) (Symmetry)
5. (C5) (Symmetry)
Coat of arms, trade marks and flags (Anthology of images)
Coat of arms, trade marks and flags (Symmetry)