Paul - do you do statistics for other things aside BFC? for example, the wife says "Paul, I'm just heading off to Asda to buy some of that Pork Roll you like" Paul "No dear , I have done some recent stats and Tesco's median price for Pork Rolls has been consistently lower for the past lower quartile at £1.86.5839p per 100grams where as Asda is £1.96527828". "OK dear, I will go to Tesco" "Great dear, can you buy me a reem of graph paper too and a new protracter"
it's an abbreviation for no text which is in reference to the main body so, basically what you see in the subject field is everything that the poster has typed.
Clever. Would be nice if it could be formatted so that there is a '-' before the nt though (another one for city tyke)