Translate English to leetspeak (1337): numbers and symbols stand in for letters.

Leetspeak, or 1337, is a way of writing where letters are replaced by numbers and symbols that look like them. It grew up on bulletin board systems in the 1980s. Being "elite" there meant access to the good files and chat rooms, and writing in leet both showed you belonged and slipped past the text filters that system operators used to block talk about hacking.
The classic swaps are 1 for I or L, 3 for E, 4 for A, 5 for S, 7 for T and 0 for O. Symbols join in too: @ for A, $ for S, # for H. A good leetspeak translator does not just run a lookup table, because the fun part is knowing when to stop.
Type your text, pick Leetspeak and press Translate. The result keeps the sentence readable, adds the occasional piece of gamer slang where it fits, and comes with a note on which swaps it used and a pronunciation line for reading it out loud.
Leet has its own grammar quirks, like the -xor ending that turned "hacker" into h4x0r, the z on the end of "skillz", and "pwned", which started life as a typo for "owned" because O and P sit next to each other on the keyboard. Newcomers are n00bs, of course.
Leetspeak suits gamer tags, funny signs and messages to friends who like a puzzle. The more characters you swap, the harder it is to read, so for a username it is worth replacing only a few. Some sites also block certain symbols, so check the rules before you sign up.
1337 is "leet" written in leetspeak, short for "elite". It is a playful way to say someone is very good at something.
The usual version is h3ll0, with 3 for E and 0 for O. Some people go further and write |-|3110.
It looks like one, but it was never really secret. It is meant to be read by people who know the common swaps.
Partly to show off elite status and partly to get around word filters on early bulletin boards.
Also try: Geek Speak · Pirate Speak · Klingon · Thieves’ Cant · All translators
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