Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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Point Group from calculated geometries for C₈H₁₄ (Bicyclo[2.2.2]octane) ¹A₁^' D_3h

Experimental Point Group is D_3h.

What does C2V (or D3h, or Cs) mean? For a general description of molecular symmetry and notation try the Wikipedia page:
https://en.wikipedia.org/wiki/Molecular_symmetry