Leet (or '1337'), also known as eleet or leetspeak, is a system of modified spellings used primarily on the Internet. It often uses character replacements in ways that play on the similarity of their glyphs via reflection or other resemblance. Additionally, it modifies certain words on the basis of a system of suffixes and alternative meanings. There are many dialects or linguistic varieties in different online communities.

The term 'leet' is derived from the word elite, used as an adjective to describe skill or accomplishment, especially in the fields of online gaming and computer hacking. The leet lexicon includes spellings of the word as 1337 or leet.

COOL FACT: The purple color at the beginning of this post has hex code 572355, which is the word STRESS written in numbers. 👾

Also, titles of visual novels VA-11 Hall-A and N1RV Ann-A = leet style text.