On the left are represented the more traditional and descriptive terms "end" and "slotback" (SB). The latter is for a position that would be labeled "FL", except that the back is in a "slot" between tackle and end (instead of outside of the end), here illustrating a double "wide slot" formation. (It is wide because the end is fully split, rather than merely flexed—see above.) There being no tight end, there seems to be no need to label either end as split; both are. But on the right, the slotback and end positions are merely labeled as wide receivers. The single running back here is shown to one side of the center-quarterback combination, but that "ace" RB could as well be directly behind them.