Newbie here!!!

Hey folks how are you all doing just got a quick question. Been browsing through a couple of profiles and they provide L1,L2,L3?? What does that mean what do they stand for. I can't figure it out. Can anybody explain?? Thanks.

http://www.urbandictionary.com/define.php?term=L1

http://www.urbandictionary.com/define.php?term=L2

http://www.urbandictionary.com/define.php?term=L3

Thanks soo much. now I know and knowing is half the battle. Thanks.

have fun!!!