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The most common numbering system for RFID devices is the EPC, or Electronic Product Code. The EPC is designed specifically for unique identification of individual items in supply chain applications and inventory management. It provides a standardized way to identify products, similar to how barcodes function in traditional retail settings.

The EPC includes a unique identifier that can contain information about the manufacturer, product type, and specific item, allowing for efficient tracking and management of goods. This system supports seamless integration into automated tracking systems, enhancing visibility and traceability in logistics operations.

In contrast, while UPC (Universal Product Code) is frequently used for retail products, it is not as universally applicable for RFID technology. UPCs typically encode limited product information and are mainly intended for point-of-sale environments. RPC (Returnable Plastic Container) and IPC (Intelligent Packaging Code) are less widely recognized and focused on specific applications rather than serving as a general standard for RFID. Therefore, EPC is the preferred choice when discussing the most common numbering system used in RFID.