ammoniumyl radical ions

H3N.+ and its hydrocarbyl derivatives, e.g. (CH3)3N.+ trimethylammoniumyl, PhN.+H2 phenylammoniumyl or benzenaminiumyl.
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1317
See also:
PAC, 1993, 65, 1357 (Revised nomenclature for radicals, ions, radical ions and related species (IUPAC Recommendations 1993)) on page 1357