- "Nice tattoo."
- ―Buffy Summers to Angel[src]
One of Angel's most defining physical traits is a large tattoo behind his left shoulder. The tattoo depicts a griffin from the Book of Kells, with the addition of the letter "A" beneath it. According to Rupert Giles, the diary of a Watcher before him states the tattoo as a means of identifying him from other Vampires. However, when and where he received the tattoo has yet to be revealed.