What is Leet Speak? History of 1337

Published April 21, 2025 · 7 min read

Leet speak (also written as "1337 speak" or "l33t") is a form of internet slang where letters are replaced with numbers and symbols that look similar. What started in hacker culture has become a widespread internet phenomenon. Ever wondered why people write "N00b" instead of "Noob"? That's leet speak.

Origins: BBS Culture in the 1980s

Leet speak originated on bulletin board systems (BBS) in the 1980s. Early hackers and phreaks used it to evade text filtering and content moderation systems. By replacing letters with numbers, they could bypass keyword filters.

The term "leet" likely comes from the word "elite" — users of leet speak considered themselves part of an elite group of internet users. The number 1337 (written as "leet") became synonymous with the culture.

How Leet Speak Works

Leet speak substitutes letters with numbers and symbols that resemble them:

Examples

Evolution: From Hacker Culture to Mainstream

Throughout the 1990s and 2000s, leet speak spread from hacker forums to gaming communities, forums, and early social media. It became associated with gaming culture and internet humor.

Peak leet speak usage was probably in the early 2000s. Today, it's less common but still used for humor, nostalgia, and internet culture references. It's become a meme in itself.

Modern Uses

• Gaming: Still common in gaming communities and usernames
• Humor: Used ironically to reference internet culture
• Nostalgia: Used by older internet users to remember early internet days
• Usernames: Many gaming and online usernames still use leet speak
• Memes: Referenced in memes and internet humor

Why Leet Speak Matters

Leet speak represents early internet culture and creativity. It shows how communities develop their own language and codes. It's a piece of internet history that influenced how people communicate online.

Today, leet speak is recognized as an important part of internet history and meme culture. Try our leet speak converter to create your own leet text!