alphanumeric-string represents an alphanumeric string. For example, here is the name of the mapping file that Solaris includes:
You include the three digits to ensure that the Adapter reads the files in a more precise order. For example, 002SUNWlvma.map is read before 050SUNWwbcou.map.
You must allow root to at least read the mapping files that you create.
$ chmod 400 002SUNWlvma.map