foot·print 
(ftprĭnt′)
(ftprĭnt′)n.
1. An outline or indentation left by a foot on a surface. Also called footmark, footstep.
2. The surface space occupied by a structure or device: the footprint of a building.
3.
a. The impact that a particular activity, person, or group has on the environment.
b. See carbon footprint.
c. The area affected or covered by a device or phenomenon: the footprint of a communications satellite.