Ah, interesting. I was guessing maybe it's something about the structure of the word, capitalisation indicating a new part of the word or something, rather than "n" and "N" being different letters. I suppose the original script is one that doesn't have distinct "lower-case" and "capital" versions of the letters? (Now I wonder why the Latin, Greek, and Cyrillic scripts do, but that might be a question for
Linguistics or
History.)