A sword with two blades is commonly referred to as a double-bladed sword or a twin-bladed sword. It is a type of weapon that features two blades extending from a central hilt or handle. The double-bladed design allows for unique combat techniques and versatility in battle.

In some cases, a sword with two blades may also be called a dual-bladed sword or a double-edged sword, though the latter term can also refer to swords with a blade on each side of a single edge. The specific terminology may vary depending on the context or cultural origin of the sword.

It's worth noting that double-bladed swords are more commonly associated with fictional depictions, such as in fantasy or science fiction settings. These swords often possess fantastical properties or are wielded by characters with exceptional skill or abilities. In reality, double-bladed swords are less common and less practical compared to traditional single-bladed swords due to their unique design and associated challenges in handling and combat effectiveness.