Attractive interaction between planar aromatic rings, in nucleic acids being one of the critical forces stabilizing double- and multistranded structures.
Note: Stacking interactions are involved in binding of intercalators to DNA.
Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1186 (https://doi.org/10.1515/pac-2016-1120)