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A language especially designed to be fast, embeddable, and very flexible. The main idiom of the language is that everything is an expression (constant or otherwise), and the program itself is a list of expressions (whereas the last expression in a list is the return value). Any variable is an expression, or a list of expressions. Functions are also expressions, so they are first class citizens. The language is a mix of imperative and functional programming.
It was first meant to be a calculator and evolved from there.