cation-π interaction 

https://doi.org/10.1351/goldbook.08154
Noncovalent attractive force between a positive ion (metal cation, protonated Brønsted base, etc.) and a π electron system.
Source:
PAC, 2022, 94, 353. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 2021)) on page 381 [Terms] [Paper]