cons

cons /konz/ or /kons/  [from LISP] 1. vt. To add a new
   element to a specified list, esp. at the top.  "OK, cons picking
   a replacement for the console TTY onto the agenda."  2. `cons
   up' vt. To synthesize from smaller pieces "to cons up an
   example".

   In LISP itself, `cons' is the most fundamental operation for
   building structures.  It takes any two objects and returns a
   `dot-pair' or two-branched tree with one object hanging from each
   branch.  Because the result of a cons is an object, it can be used
   to build binary trees of any shape and complexity.  Hackers think
   of it as a sort of universal constructor, and that is where the
   jargon meanings spring from.