Sgt. Penelope F. Whip (TTO)
More like a free back handspring than a layout, the whip back is not a standalone acrobatic element in floor routines but is used in place of back handsprings to gain connection value in passes culminating in a D+ tumbling element.
(D+ as in D or more, not the grade D+. Although also that sometimes.)
Two whips are used in indirect connections for 0.1 (with D elements) or 0.2 (with E elements), while one whip can garner the same bonus when used in a direct connection. So there’s potentially a lot to be gained by whipping, though most gymnasts do not elect to travel in such a manner.
Also it cool looking ‘n such.