A few months ago a good friend of mine who was going through a tough divorce told me that while spending some quality time with his young daughter he began telling her tales from the Nordic mythology. He's daughter liked these stories, especially those about Thor, the God of Thunder.
Unlike the unfortunate comics franchise, the Nordic tales actually revolved around deep symbolism, proverbs, ancient wisdom, and even philosophy. For example, during a set of heroic trials, Thor was forced to fight an old woman. To his surprise, he couldn't defeat her, because the old woman was a representation of old age and no one is able to fight it.
As for my friend, he literally found the ancient sources and translations of the stories. After reading these stories, he asked me if I could design and create a Mjölnir talisman. Despite the fact that I don't have enough time to take custom orders, I agreed, because of his current situation, and after weeks I finally finished creating the pieces based on some ancient talismans that were found in excavations.
The model was finished during this time of quarantine when most of us cannot travel, and long-distance journies to magical places are restricted, that is why I think it's a perfect symbol for two reasons:
The first one is that the Thor's Hammer - The Mjölnir was a symbol of protection and symbolized among other things the cosmic order and a symbol of defence against the forces of evil and chaos.
The second thing is that the Vikings were a nation of seamen, sailing across the ocean in their glorious Dragon ships, so it is a symbol of protection during one's journey against all sorts of evil, mayhem, and calamity.