"D/D" (Ｄ（ディー）Ｄ（ディー） DīDī), known as DD in the English manga and pronounced "Double D" in the dubbed anime, is an archetype of primarily DARK Fiend monsters used by Declan Akaba in the Yu-Gi-Oh! ARC-V anime and manga. It is supported by its own sub-archetype; "D/D/D".