notch

a V-shaped indentation; "mandibular notch"

the location in a range of mountains of a geological formation that is lower than the surrounding peaks; "we got through the pass before it started to snow"

a V-shaped or U-shaped indentation carved or scratched into a surface; "there were four notches in the handle of his revolver"

a small cut

cut or make a notch into; "notch the rope"

notch a surface to record something