IL is the USPS
abbreviation for Illinois
Secondly, it is the incorrect way of spelling 'ill'. Now why would you go out of your way to misspell a word. Beats me.
'Il' is also 'he' in French. The plural form would be 'ils' (they), but you don't actually pronounce the 's', it's just there for your reading/writing pleasure, and of course grammatical purposes.
As far as conversation goes, many French speakers will suppress the 'l' sound. This is sort of like the slur in English when you say "y'know" where you suppress the 'ou' from 'you'. By suppressing the 'l' sound, only the 'i' remains and sometimes on ICQ, IRC or Email, it will be written as a 'y'.
Please do not confuse the pronoun
'y' and this slang
notation form of 'il'/'ils'.
Thirdly, 'il' is also the Sino-Korean word (as opposed to Pure Korean) for 'one' and also 'day' (like Ilbon which is Japan in Korean).
N-Wing contributed to this writeup. Go give him a hug and kiss.