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In page Swastika:

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When the Chinese writing system was introduced to Japan in the 8th century, the swastika was adopted into the Japanese language and culture. It is commonly referred as the manji (lit.'10,000-character'). Since the Middle Ages, it has been used as a mon by various Japanese families such as Tsugaru clan, Hachisuka clan or around 60 clans that belong to Tokugawa clan.[5] The city of Hirosaki in Aomori Prefecture designates this symbol as its official flag, which stemmed from its use in the emblem of the Tsugaru clan, the lords of Hirosaki Domain during the Edo period.[citation needed]