My son had a seal made with my name on it, and that is stamped in the lower left hand corner. Seals are used to 'sign' your name on official documents in China and Taiwan, and no two are alike, even if you have the same full name as a thousand people. Fun fact!
I told my son that I chose to believe that the Chinese writings were all thought provoking or spiritual articles, but it's actually the classified section and contains ads for iPhones and Honda Civics. Ha!