W3. (abbreviation for World Wide Web)Literally, W3 means "the letter "W," repeated three times." It's a more popular abbreviation for the World Wide Web in Europe than it is in the U.S. where the abbreviation "WWW" is more common. In case you're wondering why this abbreviation is worth knowing, try saying "double-you" three times quickly, and you'll start to catch on ("double-you three" is a whole lot faster to say). Since the abbreviation occurs fairly commonly (as in the next term here), we thought you'd like to know.