Economics, Law, Accounting; all examples of a profession where learning the language is half the battle to understanding the topic. You can officially add Internet Marketing to that list. No worries, Samir to the rescue, here is a list of Search Related Acronyms and what they mean.

A
API - Application Programming Interface
B
B2B - Business to Business
B2C - Business to Consumer
B2E - Business to Employee
C
CPA - Cost Per Action
CPC - Cost Per Click
CMS - Content Management System
CPL - Cost Per Lead
CPM - Cost Per Thousand
CSS - Cascading Style Sheet
CSV - Comma Separated Values
CWO - Chief Web Officer
D
DC - Data Center
DMOZ - Directory MOZilla
DNS - Domain Name System
DOM - Document Object Model
DRP - Directory Result Pages
DTC - Direct Traffic Center
E
ECPM - Effective Cost Per Thousand
EPC - Earning Per Click
F
FAQ - Frequently Asked Question
FTP - File Transfer Protocol
G
GUI - Graphical User Interface
H
HTM - Hypertext Markup Language
HTML - Hypertext Markup Language
HTTP - Hypertext Transfer Protocol
I
IBL - Inbound Link
ICANN - Internet Corporation for Assigned Names and Numbers
ICRA - Internet Content Rating Association
IIS - Internet Information Service
IM - Internet Marketing / Instant Message
IP - Internet Protocol
ISP - Internet Service Provider
IT - Information Technology
K
KDA - Keyword Density Analyzer
KEI - Keyword Effectiveness Index
M
MLM - Multi Level Marketing
N
NDA - Non-Disclosure Agreement
O
OBL - Outbound Link
ODP - Open Directory Project
P
PFI - Pay For Inclusion
PFP - Pay For Performance
PPC - Price Per Click
PPR - Pay Per Rank
PPV - Pay Per Visitor
PR - Google PageRank / Press Release
PSA - Public Service Ad
R
ROI - Return On Investment
S
SE - Search Engine
SEO - Search Engine Optimization
SEM - Search Engine Marketing
SEMPO - Search Engine Marketing Professional Organization
SERP - Search Engine Result Pages
SMM - Social Media Marketing
SMO - Social Media Optimization
SMX - SEO Conference
STATS - Statistics
T
TLD - Top Level Domain
U
UBE - Unsolicited Bulk Email
URL - Uniform Resource Locator
V
VC - Venture Capital
W
W3C - World Wide Web Consortium