greeble

A small piece of detailing added to break up the surface of an object and add visual interest, particularly in movie special effects.

Any of a set of invented novel objects used as stimuli in psychological studies of object and face recognition.

(informal, whimsical) An imaginary or invisible creature, such as a bug or spirit, that a cat or other pet is perceived to be chasing or reacting to, often characterized by sudden, frantic movements as if hunting something unseen.

To add greebles to a surface.