Gundam is a Japanese science-fiction media franchise that began with the 1979 television anime Mobile Suit Gundam. It spans animation, manga, games, and model kits.
The slang '黑歷史' (literally 'dark history,' meaning 'embarrassing past') originated from the anime '∀ Gundam.' In the show, it referred to a taboo era of humanity's warlike past. The term later became widespread slang for 'a past one would rather forget.'