A commonly used but undesirable term for @A00561@ (Should not be confused with 'azimino', the name for the bridging group, –N=N–NH–).
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1321 [Terms] [Paper]