"Movable elements" refers to objects or items that can be easily shifted or rearranged from one place to another. These objects are not fixed or permanent in one position and can be adjusted according to one's needs or preferences. Full definition
Modern mammalian genomes also contain numerous intact movable elements, such as retrotransposon LINE - 1, that use RNA intermediates to spread about the genome. (carnegiescience.edu)
It's not clear whether this blade is an active movable element, but having its outer ends crossing behind the taillights is a very nice visual effect. (automobilemag.com)
The aerodynamics concept also includes the new, in part movable elements at the front, on the sides and at the rear of the Audi e-tron quattro concept. (greencarcongress.com)