silasesquithianes

https://doi.org/10.1351/goldbook.S05667
Compounds in which every silicon atom is linked to three sulfur atoms and every sulfur atom is linked to two silicon atoms, and having the general formula $\ce{(SiH)_{2n}S_{3n}}$. By extension hydrocarbyl derivatives are commonly included.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1366 [Terms] [Paper]