A - Adult region rating
AFK - Away from Keyboard
AO- Animation Overrider - a set of realistic animations in a HUD ((Head up Display)) that your avatar cycles through (stands, walks, sits, etc.)
AR - Abuse report - formal report to Linden Lab of a violation of Terms of Service and/or Community Standards
ARC - Avatar Rendering Cost - processing power consumed to render an avatar
AV - Avatar
BRB - Be Right Back
BTW - By the way
FPS - Frames per second, a measure of performance
FWIW - For what it's worth
G - Region rating that does not allow profanity, nudity, sex
GTSY - Good to see you
HUD - Head Up Display - an on screen control panel
IKR - I know, right?
IM - a private instant message
IMHO - in my honest opinion
IRL - in real life
JIRA - bug tracker - https://jira.secondlife.com
L$ - Lindens = Second life money/currency
LL - Linden Lab - Owner/Creator of Second Life - https://www.lindenlab.com/about
LM - Landmark - used to teleport to and store Second Life locations
m - square meters
M - Mature region rating
NC - Note card - used to store and share information
NVM - never mind
OMG - Oh my God
OOC - Out of character
PG - Club/Business/Parcel rating that does not allow profanity, nudity, sex
RL - Real life
RLV - Restrained Love Viewer - https://community.secondlife.com/forums/topic/125340-help-with-understanding-rlv/
RP - Role Play
SL - Second Life
SLT - Second Life Time = California, USA Time
SLURL - A web link that launches a teleport
TOS - Terms of Service - Second Life rules - https://www.lindenlab.com/tos
TP - teleport - how avatars travel in Second Life
TTYL - Talk to you later
TY - Thank you
TYT - Take your time
UUID - unique identifier # in Second Life Asset Server Data base
WB - Welcome Back
YW - You're welcome
YVW - You're very welcome
http://wiki.secondlife.com/wiki/Acronyms
http://wiki.secondlife.com/wiki/Category:Glossary
http://www.inkwelle.com/glossary_nci.shtml#landmark