Thanks. I'm curious why anyone thought it was a good idea to have a special American version, making some letters incompatible but not others. The letter O is

Thanks. I'm curious why anyone thought it was a good idea to have a special American version, making some letters incompatible but not others. The letter O is different among all three. The American and Continental versions of ZERO is simply mind-boggling. They're really all over the place. I hope ITU is the one that should be in use. I'd hate to put the effort in and then find it was wasted on a variant nobody uses. I just compared my variables, and fortunately the code I'm writing is already started with the International version.