https://doi.org/10.1351/goldbook.H02883
Compounds containing the divalent hydrazo group, $\ce{–NHNH\bond{–}}$, such as hydrazoarenes (1,2-diarylhydrazines or 1,2-diaryldiazanes, usually with both aryl groups the same) and their N-substituted derivatives $\ce{ArNRNRAr}$.
See also: hydrazines