Symmetry in a flag
The flag of Europe has a dihedral symmetry of type D1. The 12 equal stars can't produce a higher degree of symmetry because there's just one reflection and just one rotation (the identity) that sends the flag in itself.
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The image belongs to the sections...:
* (D1) (Symmetry)
Coat of arms, trade marks and flags (Anthology of images)
Coat of arms, trade marks and flags (Symmetry)
(2D geometry)
