tritium

Also contains definitions of: tritide, tritio, triton
https://doi.org/10.1351/goldbook.T06513
A specific name for the atom 3H. The cation 3H+ is a triton, the species 3H− is a tritide anion and 3H is the tritio group.
Source:
PAC, 1988, 60, 1115. 'Names for hydrogen atoms, ions, and groups, and for reactions involving them (Recommendations 1988)' on page 1116 (https://doi.org/10.1351/pac198860071115)