"The Infinity Symbol is a treasure closely related to Martial Souls. It is because the creator of this treasure was called Infinity Emperor who came from Spiritas Race of Chaos. You can also call them Soul Race. The people of this race don't have a physical body, they are in the form of souls. And what they cultivate is also souls."
While everyone was in a shocked state and was discussing about Su Yun, Ye Xiao was busy communicating with the Domineering God Crystal. The Domineering God Crystal was telling about Infinity Edge Blade and the Infinity Symbol.
Coincidently, not only both treasures are Empyrean Rank Treasures, but they also have the word "Infinity" in their names. It was really such a wonderful coincidence.
The Domineering God Crystal told him that the Infinity Symbol is actually a huge infinity symbol-shaped treasure. It was never given a name, so calling it simply Infinity Symbol is ok.
