These are mayan numerals.Scientists believe that they did not make this.They actually found it.However no one really knows.
There are more numbers but historians can only go up to a certain amount.
Some of the mayans really fought over how the calendar should look. No one really disliked it but they all had their own opinion of how it should look. Thats what really got them angry. No one liked any ones ideas. That's why they a
this is an image was found on pictures.com It is an image of the mayan calender.