I saw a presentation on Forth and ever since then I've loved tinkering with it. The language is old, fast and powerful. It isn't quite compiled or interpreted

I saw a presentation on Forth and ever since then I've loved tinkering with it. The language is old, fast and powerful. It isn't quite compiled or interpreted (or maybe it's both), it can run on teeny tiny microcontrollers or be used for scripting. The best part is, it's a completely different paradigm of how to program from any of the other modern languages I've used. There are no function arguments, and everything is done in reverse polish notation. There's no concept of parentheses in the language (parens are used for comments)