Leet speak, also known as "1337 speak," is a type of internet slang that involves using a combination of letters, numbers, and special characters to replace the regular letters in a word or phrase. It originated in online gaming communities and was used as a way for players to communicate with each other quickly and efficiently while maintaining some level of secrecy or exclusivity.

Leet speak is characterized by its use of substitution ciphers, where letters are replaced by numbers or other symbols that resemble the original letter. For example, the word "leet" might be written as "1337" or "l33t." Other common substitutions include "4" for "A," "3" for "E," "1" for "I," "0" for "O," and "5" for "S."

Although leet speak originated in online gaming communities, it has since spread to other online communities and can be seen in chat rooms, forums, and even in text messages. While it may be difficult to read or understand for those unfamiliar with it, leet speak can be seen as a form of online shorthand that allows users to communicate quickly and efficiently while also expressing a sense of belonging to a particular online community.
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