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  "body": "\n## Summary\n\nIn mathematics, the **binary cyclic group** of the *n*-gon is the cyclic group of order 2*n*, $C_{2n}$, thought of as an extension of the cyclic group $C_n$ by a [[cyclic group|0B85Q41RP6]] of order 2. Coxeter writes the *binary cyclic group* with angle-brackets, ⟨*n*⟩, and the index 2 subgroup as (*n*) or \\[*n*\\]\u003csup\u003e\\+\u003c/sup\u003e.\n",
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