A language made up of everything that is not a C program. It includes empty files, programs in all other languages, jpegs, political screeds, crumpled up paper, wind, oranges, any piece of text (or other information) that is not a C program, or fails to be C, meaning it includes C programs with syntax errors. C programs with syntax errors are the most interesting examples of ↄ programs, because its likeness to an actual C program invokes more complex behaviors from the ↄ language.
The rules of the ↄ language are not listed in its description; only an investigation of the ↄ interpreter will reveal the complete language. Some C compilers are ↄ interpreters, others are not. However, there are three types of behaviors, depending on which line of the ↄ program it first diverges from C.
Divide the line number of the first C syntax error(s) by three. Based on the remainder:
Since each of these run very quickly, and none interact with the system in any other way, they can be hard to tell apart. Any C compiler that simply reports a C compilation error may also secretly be a ↄ interpreter. The full set of C compilers that execute ↄ code is not available at this time.