amidium ions

https://doi.org/10.1351/goldbook.A00268
Cations formally derived by the addition of one @H02904@ to the N or O atom of an @A00266@ and N-@H02891@ derivatives thereof. In organic chemistry an unspecified amidium ion is commonly a carboxamidium ion
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or
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The term does not imply knowledge concerning the position of the cationic centre, e.g. PhC(=O)N+Me3N,N,N-trimethylbenzamidium.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1315 [Terms] [Paper]