**Defined in theory: Kif-numbers****Source code: kif-numbers.lisp**

**Documentation:**The term {tt (signum $tau$)} denotes the sign of the object denoted by $tau$. This is one of -1, 1, or 0 for rational numbers and one of -1.0, 1.0, or 0.0 for floating point numbers.

**Arity:**2