A double-bladed sword is commonly referred to as a "two-handed sword" or a "double-edged sword." These terms describe the general concept of a sword with blades on both ends. However, it's important to note that there isn't a specific, universally accepted term exclusively used to describe double-bladed swords.

The specific names or designations for double-bladed swords can vary based on cultural and historical contexts. For example:

1. Zweihänder: This term is used to refer to a specific type of double-handed sword used in Europe during the late medieval and Renaissance periods. The Zweihänder, meaning "two-hander" in German, featured an elongated grip and an exceptionally long blade.
2. Dandao: In Chinese martial arts, the term "dandao" can be used to describe a double-bladed weapon. However, it's important to note that dandao can refer to a variety of different weapons, including polearms and staff-like weapons with blades on both ends.

It's worth noting that the term "double-bladed lightsaber" is also used in the Star Wars universe to describe the weapon wielded by certain characters. However, this is a fictional concept specific to the Star Wars franchise.

In general, the term "double-bladed sword" or "two-handed sword" serves as a broad description for a sword with blades on both ends, while specific names or terms can vary based on cultural, historical, or fictional contexts.