Order code is a term that refers to a unique identification number that is used to identify a particular product or service when placing an order. There are several other terms that can be used as synonyms for order code, including product code, item code, SKU (Stock Keeping Unit), part number, and reference number. These terms are all interchangeable and mean the same thing, which is a code that is used to identify a specific product or service. Using these synonyms can help to make communication easier between buyers and sellers, ensuring that the right product is ordered and delivered to the correct location.