Notching is a metal-cutting process used on sheet-metal or thin bar-stock, sometimes on angle sections or tube. A shearing or punching process is used in a press, so as to cut vertically down and perpendicular to the surface, working from the edge of a work-piece.

Whats the definition of notches?

notch • \NAHTCH\ • noun. 1 a : a V-shaped indentation b : a slit made to serve as a record c : a rounded indentation cut into the pages of a book on the edge opposite the spine 2 : a deep close pass : gap 3 : degree, step. Examples: The angle of the futon can be adjusted by inserting the pin into one of three notches. ...

What is a notch on a bone?

an indentation, especially one on the edge of a bone or other organ; called also incisure.