Leet speak is a type of internet slang where the spelling and presentation of words is modified to use look-alike digits, symbols and sounds to represent the letters in a word. Prominent examples of leet include "n00b", "pwn", "hax0r" and "Deadmau5". 

It originated as a method of defeating text filters and evolved into a system of communication among hacker communities on the early internet, before entering the mainstream through video games in the late 2000s. Nowadays it is rarely seen as a complete method of communication, and more often the practice of encoding text in this manner is associated with solving complex password requirements.
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