order number

When you buy something that has to be mailed, emailed, or shipped, you usually get an invoice. An invoice is a document which shows details about your order. It may have various numbers or codes printed on it, including:

  • an order number, which identifies your order
  • an invoice number, which identifies the invoice itself
  • a customer number, which identifies you
  • a tracking code, which you can use to find out where your package is while it's being sent
  • item numbers for each of the things that you bought

This phrase appears in these lessons: