UN Identification Numbers are four-digit numbers used to identify

• A. Transportation routes
• B. Specific hazardous materials
• C. Packaging types
• D. Country of origin

Answer: (B)

UN Identification Numbers are four-digit codes that identify specific hazardous materials to standardize identification across international transport and emergency response. Each number points to a particular substance, so shipping papers, labels, and placards can quickly convey exactly what material is involved and what hazards it presents. This helps responders take the correct protective actions and handling procedures without needing to decipher the full chemical name. The UN number works alongside other labeling like the proper shipping name, hazard class, and packing group to provide a complete safety picture. It doesn’t indicate transportation routes, packaging types, or country of origin, which are described by other data. For example, gasoline is identified by the UN number 1203, linking to its specific hazards and required precautions.