Is there a proper, PC term for it? We all know the dividing line which is meant- roughly approximated by a PE license- but is there a term for it? "Licensed Engineer"?

In some states, using the word "engineer" for a non-licensed position or person is against the law. In other words, in some states the term is simply "engineer".

In that context, it's funny how upset folks in threads like these get over phrases like "real engineer".