Meaning of the word "order number" in English

What does "order number" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

order number

US /ˈɔːr.dər ˈnʌm.bər/
UK /ˈɔː.də ˈnʌm.bər/

Noun

a unique number assigned to a customer's purchase or transaction for identification and tracking purposes

Example:
Please provide your order number when contacting customer service.
I need to check the status of my delivery, but I can't find my order number.