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大天使 is the title Archangel in Chinese characters, Japanese Kanji, and old Korean Hanja.
The first character means big or great (in this case, it means “arch”).
The second means heaven (or sky).
The last means messenger.
The second and third characters together make the title for angel, which is literally “Heaven's Messenger.”
This title would be understood as “The Chief of all Angels,” or “The Great Angel.” Some might even say it's the boss of Angels.
See Also: Angel