The nitrogen-centered radical
H2N·, formally derived by the removal of a hydrogen atom from ammonia, and its hydrocarbyl derivatives
R2N·.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1317 (https://doi.org/10.1351/pac199567081307)