symmetric top

https://doi.org/10.1351/goldbook.08693
Molecule that has two equal principal moments of inertia with the third one different.
See also: asymmetric top
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 766 [Terms] [Paper]