leet (2) Look up leet at Dictionary.com
by 1997, ASCII alternative alphabet used mostly in Internet chat, derived from elite, and sometimes the word is used in that sense (for example in online gaming).
leet (1) Look up leet at Dictionary.com
in reference to special court proceedings, late 13c., from Anglo-French lete, Anglo-Latin leta, of unknown origin; OED suggests possible connection to let (v.).