It is the logo of OPPO mobile phones.

There is this "OPPO" logo on the back of oppo mobile phones. This is what we usually call logo, that is, trademark. Any company or product produced by the company has its own specific logo. You can observe other products. Generally, there is this special logo on the outer packaging. This is a symbol of its brand and has also been patented. This is what is called The power of brand!