This document defines the numbers, both in intuitive and in set-theoretic terms, and defines the meaning of the usual operations (interleave, select, etc.) when applied to INTERCAL numbers.
CLC-INTERCAL 1.-94 break with this tradition by defining signed and unsigned integers as totally separate quantities. For example, #42 and #+42 are totally distinct entities. To be precise, #42 lies somewhere between #-42 and #+42 (but is not equal to any negative number between #-41 and #-0, or to any positive number between #+0 and #+41 - more on this fascinating subject later).
Other languages also have rational numbers. In order to avoid this concept, CLC-INTERCAL introduces lunatic numbers. A lunatic number is a sequence of INTERCAL integers, separated by their signs (if present) or by the number indicator, "#" (if the next number is unsigned). For readability, a spot (".") is allowed between consecutive numbers. For example, "1.-94" (or "1-94") is a lunatic number with two components, an unsigned 1 and a negative -94. Somewhere in this document we'll say what you can do with lunatic numbers, besides writing them down and using them to give a version number to CLC-INTERCAL.