footprint

(noun) a mark of a foot or shoe on a surface. Synonyms: footmark, step. Example: "The police made casts of the footprints in the soft earth outside the window."

(noun) a trace suggesting that something was once present or felt or otherwise important. Example: "The footprints of an earlier civilization."

(noun) the area taken up by some object. Example: "The computer had a desktop footprint of 10 by 16 inches."