"Parts of Japan gave criminals tattoos on their arms. Many are simple lines around the arm. On the bottom line, the third left, I can see the sign of “悪”, bad in Japanese. This was Kishu´s (紀州/now Mie and Wakayama prefecture) tattoo.
If you’re quite familiar with the symbol below, it could be the Deathly Hallows symbol from Harry Potter. If you know that, then I’m assuming you also know that a deer has so much value for a couple of characters in the story.