The number of arguments/operands taken by a link. By default, the links are variadic - meaning its up to the caller to determine the arity of the link. The main() link is dependent on how many arguments are given to the program
Types Of Functions
Nilads
Takes 0 arguments (arity 0). Most of the time, these are Literals
Monads
Takes 1 argument (arity 1).
H (halve) is a monad
Dyad
Takes 2 arguments (arity 2).
+ is a dyad.