Compounds having the structure, $\ce{RS(=NR)2R}$, formally derived from sulfones by replacing $\ce{(=O)2}$ by $\ce{(=NR)2}$, e.g. $\ce{Ph2S(=NH)2}$ diphenyl sulfonediimine.
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1369 [Terms] [Paper]