Oh, missed that part about integers. Then again, with these conversations, the N < Z < Q < R < C... classification automatically pops in your mind if you did m

Oh, missed that part about integers. Then again, with these conversations, the N < Z < Q < R < C... classification automatically pops in your mind if you did mathematics in last classes of high school (that's going to be a LOT of laypeople ! Of course, a lot of them, those that rarely encounter them, might then forget about this classification.) And integers are still called "natural integers", and negative numbers are NOT called "natural" ?