Comment by trenchgun

This does not seem correct. There was a vision of using M-expressions, (Metalanguage) but it never happened.

>In computer programming, M-expressions (or meta-expressions) were an early proposed syntax for the Lisp programming language, inspired by contemporary languages such as Fortran and ALGOL. The notation was never implemented into the language and, as such, it was never finalized https://en.wikipedia.org/wiki/M-expression