Vestige

The mark of the foot left on the earth; a track or footstep; a trace; a sign; hence, a faint mark or visible sign left by something which is lost, or has perished, or is no longer present; remains; as, the vestiges of ancient magnificence in Palmyra; vestiges of former population.

an indication that something has been present; "there wasn't a trace of evidence for the claim"; "a tincture of condescension"