I have no idea. I saw the above on a FedEx Express label on a box put out for recycling. It was in fact on two labels, so it must be a real FedEx category: Actual & Dim. Logic suggests it's abbreviations ("Dim" for "Dimension"?) or acronyms -- though if "Dim" is an acronym I want it to stand for Deliver IMmediately -- but it made me laugh because it sure does describe how I've been feeling these days: stuck in reality, totally unimaginative and not very bright.