What are "points" (in relation to the music industry)?

Just read this article by Steve Albini (big time rock producer/engineer - he did the Pixies, Nirvana, etc.). Very interesting, very eye-opening.

But anyway, in it, he mentions things like:

And so my question: What are points?

Percentage points, or percentage of the profits.

Points are percentage points of a certain definition of profit, also called “back end.”