Leet.

• Leet ( or 1337 ) is the form of communication used by computer hackers.
• Leet is an alternative English alphabet which is made up of mostly symbols which resemble each letter, e.g, [ for C. 
• It is most commonly used online. 
• It originated in the 1980's by computer hackers to avoid instant recognition. 
• It has since spread and is used by gamers, in forums among other things. 
• It is most commonly used in usernames, often to express individuality.
• Most common on forums, chat rooms and online games.
• Leet comes from the world 'elite' which means 'better than everyone else'
• Leet is mostly used in English but can also be used in French, Spanish or German.
• Leetspeak is a mixture of words (often computer related) and are often spelt incorrectly e.g t3h instead of 'the'. 
• NOTE: That only vowels are changed into numbers, so people wouldn't spell words completely in leet. 

nn&¬!$$4  < my name in leet. :)

 Vocabulary:  

• bai --- bye
• carp --- crap
• ceak --- cake
• nd --- and
• d00d --- dude
• form --- from
• guise --- guys