Symmetry plays a pivotal role in determining various molecular characteristics, such as excitation degeneracy and transition selection rules. Despite its significance, many quantum chemistry databases often overlook this crucial aspect. Bridging this gap, the QM-sym database emerges as a valuable resource, meticulously documenting the C nh symmetry for each molecule within its vast repository. Comprising 135,000 structures featuring elements like H, B, C, N, O, F, Cl, and Br, it encompasses symmetries like C 2h , C 3h , and C 4h .