what do you call this signal?

[mutantducky]

ok....I may get criticized for this but you know I think I'm going to try the following. I see the lead ref is often in the middle of the key. So when they run down he sets himself in the middle. On a two person crew I think this can be a good idea and the ref can simply shift over depending on where the play goes which they are doing in this video.
I've found I haven't been in the post position to see fouls when I'm lead and I'm staying outside the key area. Yes, I can move over but it would be easier to set up in that middle area and then shift back and forth.