HEY SORTER!! (and SULLY)

[Sully]

The computer I'm on isn't showing those images, so I can't see specifically.

YOFF would mean the TE is off the LoS.

This defense is, essentially, what I would call a 20 defense (in my terminology, this is the fisrt number is the technique to the strong side, the last number to the weak side, so 20 would mean a 2 and a 0 shade).

The U/H refers to the fullback/H-Back (or any player who is "in" for that guy).
Here's where it might get a little involved
"Under vs U/H removed to open side (or YOFF)"
-This means if the fullback/H-back moves to a slot position away from the TE, the defense goes from a 20, to a 03, which is called "under" (essentially the defense Pendergast ran when he was our DC). If you look at the "Twin" slide, that shows the change in DL alignment.

Ed is the DE to the strong side. Rush is Hali, and S is the OLB opposite the Ed. What the defense does is, if they go to an under front, make sure to put the Ed over the TE (in a 6 tech) so that he isn't hooked (blocked down), and so the SLB can have inside leverage on the #2 receiver.