阴阳师中的勾玉是什么？

I often find myself pondering over the question: Is it possible to combine two swords into one? Many animated series showcase the concept of combining two swords into one, which captivates audiences with its intriguing narrative and visual effects.
In many stories, creators frequently integrate elements like weapon upgrades and sword fusion into their plots, aiming to engage viewers' attention. For instance, in the anime series InuYasha, protagonist Sesshomaru's form features a pair of short swords on his arms. Under certain circumstances, these can be merged into a long sword.
Similarly, in the Naruto series, the main character Sasuke's Lightning Slash Sword is formed through a combination of Jiraiya's Scythe Sword and Kizashi's Sword. Furthermore, numerous other anime series also feature instances where two swords come together to create one, such as in Sword Art Online and The Devilish Book of Demons. In my opinion, this idea adds an element of creativity and excitement to the storytelling process, making for engaging and memorable experiences. However, does it really make sense? Could we ever actually achieve such a feat in reality? The answer may not lie within our physical capabilities, but it certainly sparks fascinating discussions and debates among fans and enthusiasts alike. So, is it truly impossible to merge two swords into one? Or could there be some scientific or technological breakthrough that allows us to do so in the future? In any case, whether you believe it's possible or not, the thought of combining two swords into one undoubtedly captures the imagination and curiosity of many. It's a captivating concept that keeps us exploring the boundaries of what's conceivable and achievable. So, let's continue to wonder and dream about this possibility, whether real or imagined.