Meaning of the word "reference number" in English

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

reference number

US /ˈref.ɚ.əns ˌnʌm.bɚ/
UK /ˈref.ər.əns ˌnʌm.bə/
"reference number" picture

Noun

a unique sequence of numbers or letters assigned to a specific document, transaction, or file to help identify it

Example:
Please quote your reference number when calling our customer service.
You can find the reference number at the top of your receipt.