In mythology, folklore, and popular culture, the concept of a dragon sword exists as a legendary or fictional weapon associated with dragons. However, it's important to note that there is no specific historical or real-world sword known as a "dragon sword."

In various mythologies and fantasy settings, the term "dragon sword" is often used to describe a sword specifically crafted to combat or slay dragons. These swords are often depicted as possessing unique properties or enchantments that make them particularly effective against these mythical creatures. The concept of a dragon sword can vary widely depending on the specific mythology, story, or fantasy world in which it is depicted.

It's worth mentioning that there are swords in certain cultures or legends that have associations with dragons, such as the Japanese sword Tatsu-no-Ō, which translates to "Dragon King." However, these are not commonly referred to as "dragon swords" in the general sense.

In fantasy literature, movies, and video games, the idea of a dragon sword is a popular trope and can be found in various forms of media. These depictions often explore the idea of a powerful and legendary weapon associated with dragons and their lore.