Question: what is pfn disc golf?
Answer: PFN = "pre flight numbers" and it relates to Innova discs. It's the era before Innova began to put disc flight numbers on their stamps (before 2009). I remember having to ask what "11x" meant, as in "an 11x TeeBird" (found out its relates to the stamp that says "Ken Climo - Eleven Time Disc Golf World Champion".)