In case you still do not quite understand:
First picture refers to GReaper, who by the previous posts in this thread, is German.
Second picture is a mushroom cloud, commonly associated with nuclear devices.
The third picture is that of John Hancock's signature, which is a term used in place of the word signature.
The fourth picture is beautiful abstract art.
Therefore, GReaper nukes signature art, which coincides with his announcement here:
http://forums.legionsoverdrive.com/threads/upgraded-forum-signature-update.5346/ that he is disabling images in signatures.