halonium ions

Also contains definitions of: bromonium ions, chloronium ions, iodonium ions
https://doi.org/10.1351/goldbook.H02728
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.
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Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1339 [Terms] [Paper]