A katana with a blunt or non-sharpened edge is often referred to as a "blunted" or "dull" katana. It means that the cutting edge of the sword is intentionally made non-sharp for safety reasons or specific purposes, such as training, reenactments, or stage performances.

Blunting the edge of a katana can help minimize the risk of accidental cuts or injuries during practice or when using the sword in non-combat settings. Blunted katanas are commonly used in various martial arts, theatrical productions, historical reenactments, or as decorative display pieces.

It's important to note that while a dull katana may not have a sharp edge, it still retains the weight, balance, and overall appearance of a traditional katana. Blunted katanas are designed to provide a safer alternative while preserving the aesthetics and handling characteristics of a functional katana.