It is the logo of OPPO mobile phone. According to the information on the OPPO mobile phone website, we found that there is this "OPPO" logo on the back of the OPPO mobile phone. This is what we usually call the logo, that is, the trademark. OPPO Guangdong Mobile Communications Co., Ltd., headquartered in Chang'an Town, Dongguan, is a technology company focusing on intelligent terminal products, software and Internet services. It was founded in 2004 by Chen Mingyong.