跡
あと · ato · JLPT N3 · noun
trace
👣 ato sounds like after: 跡 is what is left after, foot 足 radical = footprint
The left side 足 means foot, so the first sense of 跡 was a footprint. It grew to mean any trace left behind: ruins (遺跡), a scar (傷跡), handwriting (筆跡). Hook: ato is what remains after.