A language in which numbers and symbols are put together to look like letters. Some people create their own 1337 letters and it makes them look more 1337 by fellow 1337-speakers. Here is an alphabet of 1337 letters I know and have created:
A: 4 or l or ^ or @ or / or /-
B. l3 or 8 or ß or ]3 or l:
C: ( or ≺ or © or ¢
D: l) or l≻ or ])
E:3 or £
F: l= or # or ƒ
G:6 or 9
H: # or l-l or (-) or !-! or }-+{ or :-:
Y: ¥
Z: 2
1337 definition by Urban Dictionary