Faldage:

ee'-ox-lib-bins-DAY-en-vlab. And from WW's sentence, I deduce it to be an adverb meaning "wistfully". Okay, a subset of the population, albeit a small one, has come up with a pronunciation, and then a meaning. Is it now a word?

I'd say that, although the word it represents is not, "%" is completely unpronounceable. Wouldn't you?

Take my nickname, for example. The only reason it exists is because one day, someone spelled "animal" terribly wrong. AniamL has no agreed pronunciation, although I pronounce it "ahn-ee-AHM-ull". It has no distinct meaning, although the people with whom I have corresponded for the last year or so use it interchangeably with "animal". I don't even think I've seen it spelled correctly more than once or twice on this forum (Dr. Bill may have been the only one), so it might not even have a determined spelling. Is AniamL a word?

Once again, I think it's all based on your own definition of the word "word".