Commonly used abbreviations

301 = Permanent Server Redirect
404 = Page not Found
ACPC = Average cost per click
AFAIK = As Far As I Know
AKA = Also Known As
Algo = Algorithm
API = Application Program Interface
ATW = All the Web
B2B = Business to Business
B2C = Business to Consumer
BB = Bulletin Board
BBS = Bulletin Board System
BL = Backlink
BTW = By The Way
CPC = Cost per Click
CPL = Cost Per Lead
CPM = Cost per 1000 impressions
CSS = Cascading Style Sheets
CTR = ClickThrough Rate
DIR = Directory
DIY = Do It Yourself
DNS = Domain Name System
DTC = Direct to Consumer
DW = Dreamweaver
FAQ = Frequently Asked Questions
FFA = Free For All
FTP = File Transfer Protocol
FYA = For Your Amusement
FYI = For Your Information
G = Google
IBL = Inbound Links
IMHO = In My Humble/Honest Opinion
IMO = In My Opinion
ISP = Internet Service Provider
J/K = Just kidding
KW = Keyword
LMAO = Laughing My Ass Off
LOL = Laugh Out Loud
LS = Looksmart
LY = Lycos
MCPC = Max Cost Per Click
MNCPC = Minimum Cost Per Click
MYOB = Mind Your Own Business
NOYB = None Of Your Business
O M G = Oh, My Gosh/God
ODP = Open Directory Project
OV = Overture
PPC = Pay Per Click
PPL = Pay per lead
PR = Page Rank (Google)
ROFL = Rolling On Floor Laughing
ROFLMAO = Roll On Floor Laughing My Ass Off
ROI = Return on Investment
SEM = Search Engine Marketing
SEO = Search Engine Optimization
SERP = Search Engine Results Page
SERPS = Search Engines Results Pages
SP = Superpages
SSI = Server Side Includes
TIA = Thanks In Advance
TTYL = talk to you later
WTF = What the F***
WYSIWYG = What You See Is What You Get
Y = Yahoo
YB = Yellow book
YP = Yellow pages

I believe you may want to sticky this . IE - Internet Explorer Fx - Firefox . Just to name two of them.

Since when did "Y" = Yahoo? That's very new to me.

It's used a bit. (Y=Yahoo) Good suggestion It will be stuck.