This t shirt is inspired by those worn by everybodys favourite professor dr sheldon cooper the tee features a distressed vintage look print of the number 73 within a circle as fans of the big bang theory may know 73 is the best number why because 73 is the 21st prime number its mirror 37 is the 12th and its mirror 21 is the product of multiplying hang on to your hats 7 and 3 this is a 100 cotton t shirt inspired by one worn by sheldon jim parsons not official merchandise 8ba