filenumber
nounUK /ˈfaɪl ˌnʌmbə/
US /ˈfaɪl ˌnʌmbər/
A file number is a special number used to keep track of a document or record.
Please write the file number on the top of the form.
OTHER MEANINGS
2. A number assigned to a computer file to identify it.
The system saved the photo under file number 2045.
3. A number used by an office to organize and find papers.
The clerk looked up the file number to find the old contract.
4. An identifier given to a legal or police case.
The detective wrote down the file number for the new case.