Perforations:

A series of holes manufactured into the material to aid in separation.

perforation

 

Underscore:

Cut through the liner for easy removal.

underscore

 

Topscore:

Cut through the face stock to the liner. This method could be used to produce a “2 PART” label. The face slit is usually used on sheeted labels to make it easier to peel the face stock away from the liner.

topscore