e-t172 Wrote: > Tower Ty a écrit : > > It does not mean "null" , it does not mean "0" , it does not mean "" so just what does it signify > > > > Not a number is cryptic . If it is not a number then just what is it ? > > http://en.wikipedia.org/wiki/NaN Thanks to you all . If we had a preferred answer system the above link would be the winner .