Is dirf really a number

if you saw the icarly episode where Carly tutors chuck and makes up a number called dirf you will remember this. i looked up dirf and it said that the number is real and is scientificly called dirfma and is actually in between 7 and 8. icarly got to use it if they changed up the facts a little bit. teachers don't use it because the number was just recently added and they didnt want to confuse the children too much.