If you are taking about a small letter down at the bottom of Lincoln's bust near the rim of the coin, all cent coins since 1918 have had the initials "VDB" placed there. They are the designer's initials. If that's what you are referring to, it's nothing special. Apologies if this isn't what you meant but it's my best guess without a picture.
Incidentally, since this is in the Canadian coin forum and I don't pretend to be an expert on Canadian coins, apologies if this post doesn't make much sense. I assumed that you were speaking of a US cent coin and someone pleae correct me if this isn't the case.
Edited by ljenkins990
08/05/2011 3:50 pm