[eldoradude]

“N” has no known Roman Numeral value (that I can find on-line).

'N' = nulla, or 0.

[Cletus.D.Yokel]

I’ll need to see historical confirmation of that.
To the best of my knowledge, the concept of “zero” as a number wasn’t developed until modern calculus (around 700AD?)

Online research shows no such concept of nothing as a cipher.