English: Symmetries of a regular octagon, with markups
Reproduced from "The Symmetries of Things", Figure 20.6, Types of Octagons
The regular octagon has Dih8 dihedral symmetry, order 16, and 10 lower dihedral and cyclic symmetries. The dihedral symmetries are divided depending on whether they pass through vertices (d for diagonal) or edges (p for perpendiculars) Cyclic symmetries in the middle column are labeled as g for their central gyration orders.
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