Hahaha. You guys are funny.
More on the "Hash Marks". Well, at least I have it pegged to being a 60's Corvette thing for sure. At the 24 hours of Lemans, they were placed on the cars to tell each Grand Sport car apart from the others. Car #1 had one stripe, Car #2 had 2 stripes and obviously, car #3 had three stripes. It was also stated that they were put on the driver's side of the car so the drivers knew which side of the car the steering wheel was on as the 24 Hours of Lemans featured cars that had steering on the right and left side of different cars. The different number of Hash Marks also made it easy for the European judges to tell which car was which. When the 96 Grand Sport came out, GM stuck with 2 hash marks and that's pretty much why we use 2 today.