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"'''D/D'''" ({{Ruby|Ｄ|ディー}}{{Ruby|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]] [[Monster Card|monsters]] used by [[Declan Akaba]] in the ''[[Yu-Gi-Oh! ARC-V]]'' anime and [[Yu-Gi-Oh! ARC-V (manga)|manga]]. It is supported by its own sub-archetype, "[[D/D/D]]".

The regular "D/D" monsters seem to be based on different figures and monsters from Western mythology, while the "D/D Savant" monsters are references to great natural scientists from Western history.

So far in the [[Yu-Gi-Oh! ARC-V (manga)|ARC-V manga]], the "D/D" monsters appear to be demons with a mechanical, scientific theme (distinct in design to the "D/D Savant" monsters) and have equipment like scales or microscopes instead of faces.

According to [[Sora Perse]], "D/D" is short for "Different Dimension" (ディファレント・ディメンション ''Difarento Dimenshon''), the same as the "[[D.D.]]" series.<!--Please do not add comparisons with "D.D."; You would be comparing an English name ("D.D.") with a Japanese name ("DD"). Also, "D.D." is ''not'' an archetype.--><ref name="ep12">{{episode|Yu-Gi-Oh! ARC-V|12|ref}}</ref>