Pinch gripping involves squeezing the extended fingers towards the thumb without flexing individual digits, such as you'd experience holding a textbook.
Most strength athletes use plate pinches (holding two 25 or 45 pound plates together), but there are alternatives. For example, using two dumbbells allows you to have access to a greater range of weights. That makes it much easier to progress in smaller increments.
Some of you might have enjoyed the Diary of a Steroid User series as much as I did. It was an interesting, unapologetic, honest portrait of what it's like when an average Joe uses steroids. But however much I enjoyed it, I cringed when I read some of the "pyramid" workouts outlined by the anonymous author