It looks a lot like Forth (a RPN language). Many years ago I worked on a hardware project to build a Forth machine specifically for running ""reversed lisp"".
Many years ago I had the luck to work on a project that involved me writing a lot of code in both Lisp and PostScript (another RPN language, although not one commonly associated with manual code generation) - there is actually quite a lot that the two environments had in common - particularly the REPL and a relatively simple set of structural abstractions.