D2

D2 is an alphanumeric designation used across different domains to refer to several items, including chemistry, nutrition, sports, film, and video games.

In chemistry, D2 denotes diatomic deuterium, two deuterium atoms. Deuterium is hydrogen’s heavy isotope. D2 gas is used in research, fusion studies, and for making heavy water (D2O).

Vitamin D2, or ergocalciferol, is a plant- and fungus-derived form of vitamin D used in supplements and fortified foods; it differs from vitamin D3 (cholecalciferol).

In American college athletics, NCAA Division II (D-II) is the intermediate tier of competition, balancing athletics with academics.

D2: The Mighty Ducks, released in 1994, is the sequel to The Mighty Ducks and the second film in the series.

Diablo II (D2) is a 2000 action role-playing game by Blizzard Entertainment, later remastered as Diablo II: Resurrected. Its expansion, Lord of Destruction (LoD), added classes and content.