RFSPE

Usage: Having demonstrated an IQ level above the 99.9th percentile, which fewer than one in a thousand of the general population hold, and having had his achievements evaluated by the distinguished International Society for Philosophical Enquiry, he was promoted to Senior Research Fellow and thereby entitled to use the post-nominal letters RFSPE.

Usage: There was no doubt that James was a genius - not only a MENSA member, which was pretty high already, of course - but he had been measured as having an IQ level above the rarified 99.9th percentile, which fewer than one in a thousand of the general population hold, and after his contribution to society, creative works and other acts of distinction had been evaluated by the distinguished International Society for Philosophical Enquiry, he was promoted to Senior Research Fellow and thereby entitled to use the post-nominal letters RFSPE - an honour accorded to fewer than 30 people in the world, even by as late as 2008.