A production code, also sometimes called a product code or just a White Wolf number, is a code typically found on the spine of a book, or above its UPC code. For those products without one or both the above, it is usually found elsewhere on the packaging. Prior to 2003, most of these numbers were four digits. However, in the 21st century, five-digit numbers became far more common; Orpheus, the revised Dark Ages setting, Exalted Second Edition and the Chronicles of Darkness (the "New" World of Darkness) were all given five-digit production codes. Here on the White Wolf Wiki, we standardize production codes to five digits, adding a 0 to the front of older four-digit codes.