sulfenylium ions

Cations having the structure RS+ (RH). 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