NaN

And he always tried to get it into the IEEE standard, but failed because of a lot of reasons.

One is that there's so many exceptions in IEEE, like infinities and NaN, not a number, stuff like that.

How do you turn that into a fixed point number? You really can't.

It makes a huge mess.

So they never make a trade if they have incomplete information about a stock.

They have to fill in every single bit field.

And so they were using NaN as a fast and convenient way to stop things from happening.

Oh, interesting.