Every historical era has its acronyms, legends and heroes. If you are a millennial, it will take you a while to decipher this license plate holder. If you are over 50, it will come quickly. So will terms like carriage return, dimmer switch, “top end floor” and “hang ten.” If you want a trip down memory lane, ask your grandparents what 52/20 meant, what a 78 was and what you needed to listen to a 45. And, if your great grandparents are still alive, ask them if this is a photograph of the great grandparent of Yahoo?