I presume there must be at least 6 pillars?

Just the four. http://conjoinedtriangles.com/

[EDITED to add: For the avoidance of doubt, yes it's a spoof.]

There are only two pillars. He didn't give a name for the lateral connectors.

I quote, from that very web page: "The four pillars of CToS (pronounced see-to-ess) are Growth, Sales, Engineering and Manufacturing."

The whole thing is from the Silicon Valley TV show. I'm fairly sure that the two pillars are Sales and Engineering, but you're making me actually go watch Season Three all over again to find out if Barker referred to Growth and Manufacturing as pillars too. YouTube clips on that particular part of the series are sparse.

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.