rising sun flag
This is the naval ensign of Japan, still used in the Japanese navy (Japan Maritime Self-Defense Force). It had a red sun with sixteen rays on a white field.
Mostly confused as the Empire of Japan's state flag during invasion era until end of World War II (Empire of Japan at the time use the same flag as today's Japan). Commonly viewed in other Asian countries (Especially China and Korea) as a symbol of Japanese aggression in World War II. Many Japanese, however, disagree with this view.
If you want to use this tag, use "rising sun" tag and "flag" tag. (forum #44468)