Nock

Nock is the "lower-level" programming language that is part of the Urbit project, on which the higher-level Hoon is built. The whole project seems to be attempting to define a totally new computing infrastructure built on a virtual machine, with new languages, protocols, and mysterious terminology. Trying to figure out just what the point of the whole thing is can be difficult.

Nock appears to have a syntax that uses lots of square brackets (like LISP uses parentheses).

Links

 * Urbit official site
 * Third-party blog posting attempting to understand the Urbit project