I am looking at an OrCAD library, discrete.olb in this case, and noticed that some of the symbol icons (which look like a little NOR gates) have a little line in them. I think they are somehow linked to another symbol in that same library because I tried deleting a symbol and another symbol with a little line was deleted as well. The example I am looking at is CAP NP and CAPACITOR NON_POL in the installed libraries.
My question is does that little line signify something, and if so what? If these symbols are actually linked, can they be unassociated from each other?