"Uuunnhuh?" "Uh." There are all kinds of spoken languages, based on our ability to make noises - different noises, and varied noises. That's a phonetic alphabet (using 'alphabet' in its abstract sense:- as any set of related symbols, that convey "information"). Spoken language is obviously only one kind of language. Languages and alphabets (algebras) are mathematical - mathematics is a language, too. Is math the abstraction of symbolic meaning, and therefore language? Any language has an equivalent mathematical abstraction, a logical "map". Many of the symbols are overloaded, operator-wise, and value-wise, though, which means some languages have a very complex abstraction. If there's a "symbol" space, is there a "meaning space"?