l33t is an esoteric language based loosely on BrainF***, and influenced by Beatnik. Like other languages of its ilk, it was designed to be as brain-melting as possible to code in whilst still being Turing complete. The language has some interesting distinguishing features, such as the possibility for self-modifying code and for connectivity – it’s theoretically possible to use it to write viruses and other such antisocial software but the actual logistics of trying to write such a program put it well beyond the cognitive capabilities of the average script kiddie.
Of course it ain’t fully 133t without an l33t interpreter in javascript