"Rotational symmetry" refers to an object or shape that maintains its appearance even after being rotated around a central point. In simpler terms, it means that if you spin the object, it will still look the same as it did before. Full definition
The HTS materials in this study are layered with four-fold rotational symmetry of the crystal structure. (sciencedaily.com)
Another pattern scientists have observed in the two most famous classes of high - temperature superconductors is broken rotational symmetry without a change in translational symmetry. (sciencedaily.com)
Capital «H» has 180 - degree rotational symmetry because it is unchanged when turned upside down. (scientificamerican.com)