Thanks, sorry. Those are the number of screenings that each of those movies got on their opening Saturday in my market's 6 AMC theaters. It's intended to be a relatively representative way to measure the size of each movie's opening, since the traditional data only shares number of theaters. Every super major release is in basically every theater, so they all just get reported as ~4000 theaters. There's a lot more wiggle room that goes unreported in that. For example, Deadpool & Wolverine opened with an astronomical 179 screenings in my 6 theaters.
The higher the screening count, the more potential BO theaters are thinking that the movie has for its opening. Most of the biggest movies will have more than a single screen at each theater for the first four weeks of their release.