halonium ions

Also contains definitions of: bromonium ions, chloronium ions, iodonium ions
Ions of the form R2X+, where X is any halogen (X = Br+ , bromonium ions; X = Cl+, chloronium ions; X = F+, fluoronium ions; X = I+, iodonium ions). They may be open-chain or cyclic.
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1339 (https://doi.org/10.1351/pac199567081307)