Abbreviations: Lookup What Acronyms & Abbreviations Stand For

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Not sure what HTTP, RSVP, KGB, PHP, CSS or any other abbreviation stands for? Check out Abbreviations.com. It is a search engine where you can easily search, browse a and finds meanings for almost any acronym and abbreviation.

From the Page:  Abbreviations.com is the world’s largest and most comprehensive directory and search engine for acronyms, abbreviations and initialisms on the Internet. Abbreviations.com holds hundreds of thousands of entries organized by a large variety of categories from computing and the Web to governmental, medicine and business and it is expanding daily.

Additionally to searching and browsing you can create and keep you own list of abbreviations and acronyms.
Features:

• Lookup  what acronyms, abbreviations stand for.
• Search, browse  alphabetically, filter by category  such as Computing ,Governmental, Medical, International etc.
• Create and keep your own list of acronyms.
• Become an editor and contribute by adding new definitions.
• Supported Tools : Widget for Mac, Custom button for Google Toolbar, Firefox search plugin, IE addon.
• No sign up or registration required.
• Also check out similar website AcronymFinder.