footprint
     n 1: a mark of a foot or shoe on a surface; "the police made
          casts of the footprints in the soft earth outside the
          window" [syn: {footmark}, {step}]
     2: a trace suggesting that something was once present or felt
        or otherwise important; "the footprints of an earlier
        civilization"
     3: the area taken up by some object; "the computer had a
        desktop footprint of 10 by 16 inches"
Source: WordNet® 2.0

footprint n. 1. The floor or desk area taken up by a piece of hardware.
   2. [IBM] The audit trail (if any) left by a crashed program (often in
   plural, `footprints'). See also {toeprint}. 3. "RAM footprint": The
   minimum amount of RAM which an OS or other program takes; this figure
   gives one an idea of how much will be left for other applications. How
   actively this RAM is used is another matter entirely. Recent tendencies
   to featuritis and software bloat can expand the RAM footprint of an OS
   to the point of making it nearly unusable in practice. [This problem is,
   thankfully, limited to operating systems so stupid that they don't do
   virtual memory - ESR]


Source: The Jargon File