You are a criminal/artist in a cyberpunk and/or fantasy world with intricate fancy social codes. As a ner-do-well you have never needed your own symbol to stamp in wax for your letters (you just used your thumb) But, exciting new opportunities have you moving up in the world rapidly... suddenly you must pick a small object in your abode to make an impression: literally.

What do you choose as an impromptu standard?

With what object will you make YOUR mark?