The symbol means the product/service or anything similar is a copyrighted version not the original registered version.
If a product or something similar has a © symbol next to it, then that means it is copyrighted. Example if MEGA is registered ®️ (see ®️ symbol), but I made a MOGA which means the same, I'll have to add a ©️ to it, otherwise it is illegal.
© Symbols.com