Meaning of leetspeak in English:

leetspeak

Pronunciation /ˈliːtspiːk/

noun

(also 1337speak)
mass noun
  • An informal language or code used on the internet, in which standard letters are often replaced by numerals or special characters that resemble the letters in appearance.

    • ‘users communicated in leetspeak’

Origin

1990s from leet + -speak. The form 1337speak represents the conventions of leetspeak, with 1 representing the letter L and 3 and 7 representing the letters E and T respectively..