Refers to a remaining trace or mark left behind, often physical or metaphorical. Can be used for scars, ruins, or lingering effects.
Vestiges of the war still remain in the town.
The wound left a deep scar.
Compound of 残 (ざん, 'remain') and 痕 (こん, 'mark/trace'). The exact historical derivation is uncertain, but the kanji components directly reflect the meaning.