挨拶 Hello. Week 2, Logistic Regression as a Neural Network, video 1, Binary classification, for Deep Learning Specialization course 1. In other words… here

Instructor says, " If you ever forget what a piece of notation means, like what is M or what is N or what is something else, we’ve also posted on the course website a notation guide that you can use to quickly look up what any particular piece of notation means."

I’m sorry, I could not find this notation anywhere. Can I be pointed to where I can find it please? I apologize if I didn’t see the obvious.