A helion is the nucleus of a helium atom, a doubly positively charged cation. Wikipedia

Helium nucleus Wikipedia Disambiguation

Nucleus of helium, a doubly positively charged helium ion. In practice, helion refers specifically to the nucleus of the helium-3 isotope, consisting of two protons and one neutron. The nucleus of the other stable isotope of helium, helium-4 isotope Wikidata

A helium ion, the nucleus of a helium-3 atom. Formula: 3He+2 ; Symbol: h. Wiktionary

Nucleus of a helium-3 atom. Wiktionary (translation)