T₂

Symbol

 * 1) Tritium-tritium, an isotopic variant of the hydrogen molecule H$2$; diatomic tritium.
 * 2)  The Hausdorff property; a category of topological spaces with this property.

Usage notes
In the context of chemistry, guidelines of the (IUPAC) recommend that deuterium and tritium be called by the chemical symbols “$2$H” and “$3$H”, in preference to “D” and “T”, respectively. Thus, the preferred notation for diatomic tritium is “$3$H$2$” rather than “T$2$”.

Adjective

 * 1)  Such that any two points have disjoint neighborhoods.