vestige

A mark left on the earth by a foot.

A faint mark or visible sign left by something which is lost, or has perished, or is no longer present.

the vestiges of ancient magnificence in Palmyra

vestiges of former population

A vestigial organ; a non-functional organ or body part that was once functional in an evolutionary ancestor.

Any person seeing such a condition could not help being frightened at the conditions found, and it seems to me that that fact should lead us to think that the appendix is a vestige or becoming so.

Now this paired organ of Jacobsen began in reptiles and is well developed in many mammals. But in man it is a vestige, often disappearing altogether; and the two openings are closed.

The remaining portion of a partially suppressed sideband.

[J]ust a trace, or vestige, of the other sideband is included. In the receiver detection circuitry the vestige of the lower sideband is added to the upper sideband.