Which designation indicates that an item is back ordered?

The designation that indicates an item is back ordered is represented by the letters "BB." In the context of supply management, a back order occurs when a customer has ordered an item that is temporarily out of stock but will be supplied once it's available again. The "BB" designation serves as a clear and concise marker within supply chain systems to notify personnel that an order for that particular item is currently pending fulfillment due to stock unavailability.

Understanding these designations is crucial for effective inventory and order management, as it allows supply personnel to track the status of items, manage customer expectations, and plan for future inventory needs. The other designations, while pertinent to various aspects of supply management, do not specifically indicate a back order status.