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leetspeak

[leet-speek]
noun Digital Technology.
  1. a coded spelling system and language used in very informal communications on the Internet, featuring letters combined with numbers or special characters in place of letters that they may resemble, and including inventive misspellings, jargon, and slang.
  2. the spelling conventions and jargon of this system and language.
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Origin of leetspeak

1980–85; leet (shortening and alteration of elite) + -speak
Also called leet, l33t, 1337.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for l33t

leetspeak

noun
  1. a jargon used by some internet groups, in which standard English is translated into a mixture of letters, numerals, and symbols found on a computer keyboardAlso called: 1337
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Word Origin

C20: from elite + -speak
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012