Strictly defined, an NSFAQ is a Not So Frequently Asked Question. Typically this is a question that is pointed and direct in nature and has a well defined, but often has an obscure and/or difficult to find answer. If one cannot do a Google search and expect to find the answer, than the question is a candidate for an entry in a NSFAQ.
Credit for the terminology should be attributed to Paul Borman, who was the first person (that I know of) to put a list of NSFAQs on his web site.
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