A double-ended sword is commonly referred to as a "double-bladed sword" or a "twin sword." These terms describe a sword that has a blade on each end of the hilt. It's worth noting that while the concept of a double-ended sword exists, it is not as prevalent or widely used as single-edged or double-edged swords in historical or practical contexts. The portrayal of double-ended swords is more common in fictional works, particularly in the realm of fantasy and speculative fiction.