Which of the following is NOT a designation used in Enhanced Carrier Route mail processing?

The designation that is NOT used in Enhanced Carrier Route mail processing is ECRWSH-Platinum. Enhanced Carrier Route mail processing includes various designations that help categorize mail for better efficiency in delivery.

ECRWSH refers to Enhanced Carrier Route Walk Sequenced High Density, while ECRWSS stands for Enhanced Carrier Route Walk Sequenced Saturation, representing mail that is arranged for delivery based on the frequency of the routes and the volume of mail addressed in a specific area. ECRLOT, which means Enhanced Carrier Route Lots, is also a recognized designation.

The designation "ECRWSH-Platinum" does not exist in the context of Enhanced Carrier Route categories. The inclusion of "Platinum" implies a tier or level that is not part of the official designations, making it the correct choice for delineating what is not used in this mail processing system. Understanding these distinctions helps in grasping the functionality and categorization used by postal services for optimized mail delivery.