This part of ISO/IEC 15459 specifies a unique string of characters for the identification of individual
transport units. The character string is intended to be represented in a bar code label or other AIDC
media attached to the entity to meet management needs. To address management needs, different types
of entities are recognized in the various parts of ISO/IEC 15459, which allows different requirements to
be met by the identities associated with each type.
The rules for the unique identification for individual transport units, to identify physical logistical
transfers, with the identity relevant for the duration of one or more items in the load being held or
transported as part of that load, are defined and supported by example.