If indeed the natural numbers form an ordinal at all. If not, what condition do they fail?
Edit 1: Assuming standard American english conventions. This was inspired by the observation that zero is the last number spelled alphabetically.
Edit 2: Since we would need to agree on a convention for naming very large numbers, I propose the system of Conway and Guy, which appear to generalize to arbitrary numbers, basically by spelling the exponent/3 in latin prefix. A table is here.