Rakuten Company Logo (楽天)

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Kashiwa Sato, who studied graphic design at Tama Art University, served as Rakuten's Chief Creative Director for 15 years and designed the company's logo. The design of the logo design represents the new start of the company by blending a Japanese character for “one” in the logo. 

Rakuten Company Logo (楽天)
Source: kashiwasato.com