A double-bladed sword is commonly referred to as a "double-edged sword" or a "dual-bladed sword." These terms describe a sword that has a blade on both sides of the weapon, allowing for potential strikes or cuts from either side.

However, it's important to note that double-bladed swords are relatively rare in historical contexts and are more commonly found in works of fiction, fantasy, or in certain ceremonial or symbolic contexts.

In fiction and popular culture, double-bladed swords often go by various names, depending on the specific design and cultural inspiration. Here are a few examples:

1. Double-bladed lightsaber: This is a weapon seen in the Star Wars franchise, wielded by characters such as Darth Maul. It consists of a hilt with two energy blades extending from opposite ends.
2. Bident: A bident is a weapon with two prongs or tines, resembling a pitchfork or trident. Although not strictly a sword, it is a double-bladed weapon.
3. Khopesh: The khopesh is an ancient Egyptian weapon with a curved blade that extends on both sides, resembling a "C" shape.
4. Doppelhänder: Also known as a "greatsword" or "two-handed sword," the doppelhänder is a large, two-handed sword with a long, double-edged blade.
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It's worth noting that historical double-bladed swords used in combat were relatively uncommon, as they posed challenges in terms of weight distribution, handling, and practicality. Most traditional swords, such as the katana, longsword, or rapier, have a single cutting edge, allowing for more precise and controlled strikes.

While double-bladed swords are intriguing from a visual or fictional standpoint, they are not representative of typical historical sword designs.