One of the most well-known explorers, but least talked about unsolved codes, is the signature of Christopher Columbus. It might be surprising, that to this day, no one is completely sure on its meaning. The cause for this is because Columbus never explained his reasoning for adopting the mysterious writings of his signet. What is known, however, is that it was very important to him.
Columbus began using the mysterious signet after returning from his first voyage across the Atlantic Ocean. The first known example dates to 1483 and historians have numerous other examples and documents demonstrating the curious signature from that time on to his death. He even instructed his heirs to continue using the signet themselves.