imprint

footmark, footprint, footstep, hoofprint, path, print, pug, rut, step, tread

artifact, evidence, leavings, relic, remain(s), remainder, reminder, remnant, residual, residue, sign, spoor, telltale, token, vestige

clue, cue, hint, indication, inkling, intimation, lead, suggestion

scent, shadow, whiff

dent, hollow, indent, indentation, indenture

mark, sign