What does my classmate mean when he says I'm Sheldon?

Jim Parsons, the protagonist of the American sitcom The Big Bang Theory, which just won the Emmy Award, told an interesting story about four geek scientists. They are geniuses with high IQ, but they have all kinds of quirks in their lives and make many jokes. Sheldon, the theoretical physicist with the highest IQ, is a master of quirks and the most popular figure in this TV series, with countless fans. Because the English pronunciation of "Sheldon" is similar to that of "Schell", China fans nicknamed him "Schell". Because it is Jim Parsons who plays "Schell", China fans affectionately call him "Schell".