DGD
Dangerous goodsDangerous Goods Declaration
The signed document in which the shipper declares exactly what dangerous goods are in a shipment and that they are packed correctly.
In practice
For sea it follows the IMDG multimodal form; for air it is the IATA Shipper's Declaration. Must be signed by a trained person. The carrier will not load DG without it, and a wrong DGD makes the shipper liable for any incident.
Seen in the wild
Please sign and return the DGD; it must be on the airline's form and in English.