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A capital D with a subscript, the symmetries of a regular polygon.
Also known as: Dihedral group, Polygon symmetry group, D n
The dihedral group collects the rotations and reflections of a regular polygon, and its subscript is ambiguous in a way that costs marks: some authors write D_n for the symmetries of an n-gon, which has 2n elements, and others write D_2n for the same group.
Denotes the group of symmetries of a regular polygon, comprising its rotations and its reflections.
Contexts: Mathematics
Carries a genuinely unsettled subscript convention: D_n means the 2n-element group in geometry and the n-element group in some algebra texts, and the symbol never says which.
Contexts: Mathematics
A capital letter D with a small numeral set below and to the right.