A sword that has a dull or blunt edge is commonly referred to as a training sword, practice sword, or sparring sword. These swords are designed specifically for safe training, drilling, or sparring purposes, where the risk of injury from sharp edges is minimized.

Training swords typically have rounded or blunted edges, making them less likely to cause cuts or injuries during simulated combat or martial arts practice. They often feature a blade that is thicker and less tapered compared to a functional or sharpened sword. The bluntness of the edge reduces the risk of accidental cuts or punctures during training while still allowing for realistic movements and techniques.

The purpose of using a blunt sword during training or sparring is to focus on developing technique, timing, footwork, and other aspects of martial arts without the inherent dangers associated with sharp blades. These swords are commonly used in various martial arts disciplines, historical reenactments, stage combat, and other forms of sword-based training or performance.

It's important to note that while a blunt sword is safer for training purposes, proper protective gear, such as fencing masks and padded clothing, is still necessary to minimize the risk of injury during sparring or simulated combat.