The tattoo 13 is a common symbol in tattoos, typically representing good luck, guidance, and protection. It is believed to come from the Norse symbol for love, which is tattooed on the arm of Þór, the Norse god of thunder. For some people, the tattoo is used as a reminder of their faith or spiritual journey. The number 13 has been associated with loyalty, fidelity and protection, making it a popular tattoo choice. Some may also get the tattoo 13 as a reminder to practice self-love and to follow their own path and beliefs.