Which identifier is NOT used for LD-2?

The identifier that is not used for an LD-2 is AVM. An LD-2 is a type of unit load device (ULD) used primarily for transporting cargo on aircraft. Identifiers like DPE, DPN, and DPL are all relevant terms associated with LD-2s, representing different types of specific identifiers for handling these containers.

AVM, however, does not correspond to any identifier related specifically to LD-2 containers. Instead, AVM might refer to other aviation-related terminologies or identifiers that pertain to different areas of air cargo operations or equipment, but it does not have a direct relationship with the LD-2 type ULD specifically. This distinguishes it from the other identifiers, all of which are relevant to the management and identification of LD-2 containers used in air freight.