What does PSN stand for?

• A. Primary Shipping Number
• B. Package Safety Note
• C. Proper Shipping Name
• D. Portable Shipping Number

Answer: (C)

PSN stands for Proper Shipping Name, the standardized name used to identify hazardous materials in transport. This is the official name that appears on shipping papers, labeling, and emergency response information, ensuring consistent identification across all modes and jurisdictions. The Proper Shipping Name is determined by regulations (such as the UN Model Regulations and 49 CFR) and must match the recognized name for the material being shipped. This avoids confusion and helps handlers, carriers, and responders understand exactly what is being transported. Other terms like Primary Shipping Number or Portable Shipping Number aren’t used in hazmat regulations, and Package Safety Note isn’t a defined term in this context.