Let's say, a coder with significant law knowledge, such that he knows more about law than all the other coders and more about code than all the lawyers, in a given company.
I think this is a good example. I would just add that it helps to be able to deflect when the lawyers come to you with all of their technology problems and coders come to you with legal problems (or whatever appropriate mix of skills and problems). You don't want to end up having to fix all the printers.