2000313.16 is part of the Siba numbering system, which uses 6-digit numerical codes to identify and organize parts, components and other items that are part of a product. The first two numbers indicate the group, the middle two the subsidiary group, and the last two the item name. In this case, the 2000313.16 code would refer to an item in the 20th group, 00th subsidiary group, and 16th item name.