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This is a very basic question about PDF form specifications.
I discovered one feature.
It is for making multiple copies of a field.
It can use to create multiple vertical and horizontal fields.If I use it the new field name will be appended with ".1".
For example, if I copy 3 fields "A",the original field name will became to "A.0" and new fields name became "A.1" and "A.2".
Is this only just a way to distinguish field names?
Or is there another reason?
Because this looks like a sort of array.
If you want to name the fields any other way you will need to do it using a script.