These days i was wondering what are meaning the short words like URL or HTML and i had do some research and i have found the popular ones definition and i want to share it cause i think it`s interesting:

URL - Uniform Resource Locator
SERP - Search Engine Results Page
PR - Pagerank
SEO - Search engine optimization
SEM - Search Engine Marketing
RSS - Really Simple Syndication or Rich Site Summary
Page impressions - the numberof times your adsense ads where loaded
CTR - Click thru rate - the ratio of impressions and click in % e.g: if you have 2 impressions and 1 clicks your CTR is 50%
eCPM - Effective Cost Per Thousand Impressions (Total earnings/impressions x 1000 = eCPM)
HTML - Hypertext Mark-up Language
CSS - Cascading Style Sheet
xml - Extensible Markup Language
pdf - Portable Document Format
XHTML - Extensible Hypertext Mark-up Language
CPC - Cost per click Through
CPM - Cost Per Thousand