(geometry) That fills a closed (typically 2-dimensional or 3-dimensional) space

plural of space-filling model

plural of space-filling curve

(chemistry) A type of three-dimensional molecular model, where the atoms are represented by spheres whose radii are proportional to the radii of the atoms, and whose center-to-center distances are proportional to the distances between the atomic nuclei, all in the same scale.

(mathematical analysis) a curve whose range contains the entire 2-dimensional unit square (or the 3-dimensional unit cube)