stibonium compounds

https://doi.org/10.1351/goldbook.S06011
Salts (including hydroxides) containing an atom of tetracoordinate antimony, of the form $\ce{[R4Sb]^{+}X^{−}}$.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1367 [Terms] [Paper]