sulfenylium ions

https://doi.org/10.1351/goldbook.S06099
Cations having the structure RS+ (R ≠ H). This term is derived from sulfenic acids. The synonymous term sulfanylium ions is derived from sulfane, H2S. E.g. CH3S+ methylsulfanylium or methanesulfenylium ion.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1368 (https://doi.org/10.1351/pac199567081307)