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circled 9
In the game manual of Touhou's Phantasmagoria of Flower View, Cirno, pitted as the second player character, was labeled as "⑨" - it stood for バカ ("baka" - "idiot"). Ever since, ⑨ gained notoriety as Cirno's nickname.
Not all Cirno posts should be tagged circled 9, only posts that incorporate the 9-in-a-circle symbol.