Convert from English to Leet Speak. Leetspeak an informal language or code used on the Internet, in which standard letters are often replaced by numerals or special characters. It is also sometimes referred as H4X0R which is "Hacker" in leetspeak. Leet (or "1337"), also known as eleet or leetspeak, can be thought of as an alternative alphabet for the English language. It is used primarily on the Internet. It uses various combinations of ASCII characters to replace Latinate letters. For example, leet spellings of the word leet include 1337 and l33t; eleet may be spelled 31337 or 3l33t.