Roman Numerals

The Winnie The Pooh books use roman numerals for chapters.

Sofi: There's two I's!
Dada: That's right. That's roman for two. And look, there's three I's. That's roman for three. Do you know what roman for four is?
Sofi: Yes.
Dada: Oh, you do? What is it?
Sofi: Snuggle.