Diehard fans know what a cros is. As any true diehard fan knows, a cros is an incredibly important part of the game of baseball. For those who don't know, a cros is a small, round object that is used to mark the location of a player on the field. Without a cros, it would be nearly impossible to keep track of where everyone is on the field.   While most people think of a cros as simply a...