Sales and engineering are the two pillars of the Conjoined Triangles of Success.
[EDITED to add: For the avoidance of doubt, yes it's a spoof.]
Edit: Yep, Barker refers to Engineering and Sales as the two pillars of success in S03E02, and Growth as the "foundation" of the CToS. Compromise is the "shared hypotenuse". Jack was fired before they could discuss Manufacturing.