Here’s a short snippet of important abbreviations that you might see in SEO forum / blog posts around the web.

BL = Backlink
CSE = Comparison Shopping Engine or Custom Search Engine (Google)
CSS = Cascading Style Sheet
DC = Data Center
DMOZ = Directory - Mozilla
HTML = HyperText Markup Language
IBL = Inbound Link
IPB9 = Internet Business Promoter
LSA = Latent semantic analysis
LSI = Latent Semantic Indexing
OBL = Outbound Link
ODP = Open Direcrory Project, See DMOZ
OWBL = One way back link
PPC = Pay Per Click
PPP = Pay Per Post
PR = PageRank
RI = Regular index
RSS = RDF Site Summary, Rich Site Summary, Really Simple Syndication
SE = Search Engine
SEM = Search Engine Marketing
SEO = Search Engine Optimization (Optimisation)
SERP = Search Engine Results Page or Search Engine Results Placement
SI = Supplemental Index
SSE = Yahoo! Search Submit Express
SSP = Yahoo! Search Submit Pro
SWL = SiteWide Link
TBPR = Toolbar PageRank
TR = Trust Rank
VIPS = Visual-block Page Segmentation
WP/WP4 = Web Position/Web Position 4
XML = Extensible Markup Language

Sites

WWS = Web WorkShop
DP = Digital Point
WPW = WebPro World

Thanks for posting this Dave @ WWS