imino carbenes

This term systematically means carbenes bearing an imino or N-substituted imino group, RN=, somewhere in the molecule. E.g. R–C:–CH2C(=NR)R. It is listed here in order to warn against its misuse for alkylideneamino carbenes.
See: carbenes, nitrile ylides
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1343