[Koha] Biblio question

[Noel Goodman]

Hey all,
I noticed when adding a new biblio or editing a present record under catalogue, some of the tags have a '+' sign next to it.  
When clicked, a small text box opens.

Does anyone know:
-What exactly those '+' signs mean?
-What am I suppose to enter into the textbox provided if I click on the sign? 

Thanks,
Noel


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