Q&A with NxProse

if it is a knuckle, then there are no thief weapons. it make more sense if it were a claw because it is supposed to represent the 4 classes we have

It doesn't look much like a claw to me. It's spiked, more like a knuckle would be rather than a claw which is usually more like an overly decorated glove. Besides, I think a dagger would better represent the thief class as it is more easily recognizable than a claw.

Here is the image

 Spoiler

http://msimage.nexon.net/forum/20080708/CK_Logo.jpg