I have data file containing titles like
Invoice #ZT-123456 June 2017
or
Agreement #1_ABCD Foo Services
but I need to put these titles into an app where character # is not allowed. (Edit: And U.S. customer will see what I wrote there.)
What is the best alternative writing when I cannot use #?
I was thinking about something like this:
Invoice Nr. ZT-123456
or
Invoice nr. ZT-123456
Maybe I could use number but replacing symbol with complete word does not seem appropriate to me in this context.