The Picolisp project has been around for ages and has been used for production work and is extremely impressive in my opinion. Generally speaking, only the APL family languages require less code (based off of looking at dozens of examples on Rosetta Code). Rebol is probably just as terse too, but not much else.
As a language it is tiny and easy to understand. It can interface to C or Java and Android. It also has a built-in prolog like system. I like many of the choices made by the creator "Alexander Burger".
As a language it is tiny and easy to understand. It can interface to C or Java and Android. It also has a built-in prolog like system. I like many of the choices made by the creator "Alexander Burger".