[LANGUAGE] 1337

[Som1Lse]

What is this language exactly?

It's the 1337-speak (or just 1337, l33t or leet) that was brought to life on the internet.
It is a language where you spell letters with numbers and symbols like this:
|-|3110 \/\/0|21|)!
The above sentence reads "Hello world!"

1337 comes of the word elite.
When you pronounce elite it is pronounced eleet, and then the first "e" was removed and the last four letters was replaced with numbers it is 1337.
So "1337-speak" basically means "A language for elites".