Usual acronyms

Haver your ever seen a differents acronyms in English and you couldn't understand what's hell was the meaning?.  Don't worry I give you some of them in the following list if you know others, please feelt free to agree them in the post:

BTW: By the way
BRB: Be right back
FYI: For your information
JK: Just Kidding
LOL: laugh out loud
TTYL: talk to you later
TY: Thank you
NP: No problem
NVM: Nevermind

TTYL 