It's because technically the dollar is divided into Dimes, Cents, and Mil. (this is why dimes say 'One Dime' on them instead of 'Ten Cents'.
So while the mil isn't really used anywhere else that regular people see any more due to inflation, it is a valid division of the dollar and that's why they are able to get away with it.
So while the mil isn't really used anywhere else that regular people see any more due to inflation, it is a valid division of the dollar and that's why they are able to get away with it.