vertical stabilizer
vertical stabiliser
vertical fin
tail fin
tailfin

Box wing - upper and lower planes are joined by a vertical fin between their tips.

The vertical fin is mainly royal blue, with five white stars prominently displayed.

The aircraft had a conventional tail with a tall, straight vertical fin.

The exhaust exits at the bottom of the vertical fin.

The front grille bars had 5 small vertical fins each to differentiate them from the earlier model.

The addition of a "vertical fin" to low pitched roofs will also help.

In the female, the basal part of all the vertical fins are black.

The Goose rose on its step and picked up speed, enough for the vertical fin to bite air.

The building is unique for its outstanding white vertical fins and the fact that it curves outward on the bottom.

The air brake flaps on the vertical fin didn't open either.