Funny, I just call them "engineers".

An Engineer (with big E, as in Designer, Doctor or Lawyer) must know the business side of things, must understand how to design technical solutions that solve real problems, and must know how to factor in the costs in his designs, and must have a fundamental grasp of science and technology so that he can be versatile when needed (if he is "too" versatile, he is a generalist).

Of course, as a designer, the Engineer's designs tend to be bold but generally not deeply aesthetically pleasing. IMHO, to be a "Renaissance Man" an Engineer must also master aesthetic beauty, have a classical education and a deep fundamental knowledge of the humanities.