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In release scene naming conventions, the letter "D" or tags like "d" can refer to a couple of technical variables. Most commonly, it denotes a source release (confirming it was pulled directly from the eShop server rather than a cartridge). Alternatively, in some archival circles, it represents specific localized release groups or region-specific distribution indicators (like a European "De" German rating descriptor or global multi-language designation).

While there's no widely recognized game titled "Steven Universe: Unleash the Light Switch," there are several video games associated with the franchise, including "Steven Universe: Save the Light" for various platforms. The mention of "NSP" and "2021" suggests a potential modification or a scene-specific leak related to a Nintendo Switch game or hack, possibly involving homebrew or a fan-made modification.