Within the EAN128-/UCC128 norms, the shipping unit number/ Serialized Shipping Container Code (SSCC) is used to provide handling units with unique identification. The SSCC is 18 digits long and the first digit specifies the type of handling unit.
The following 5 values are defined in the EAN128/UCC128 norms:
0 : box
1 : pallet
2 : container
3 : unknown/not defined
4 : company-specific
5-9: reserved