Landing gear

Landing gear, also known as landing struts or landing legs, was a component of an air or spacecraft that facilitated a controlled contact with a planetary surface, space station docking bay, or other firm surface.

When used by larger vehicles such as starships, the physical landing gear was sometimes supplemented with antigravs, thrusters, structural integrity fields and inertial dampeners. 

Starfleet use
Among Federation Starfleet vehicles with landing gear were:
 * Argo-type shuttlecraft
 * (refit) - For use by the primary hull only after emergency saucer separation.
 * (SS ST (Safe Harbors))

Klingon Defense Force use
The Klingon Defense Force bird of prey had two sets of landing gear, one on either side where the wings joined the main hull.