Paper/paper-api/src/main/java/org/bukkit/Keyed.java

package org.bukkit;

/**
 * Represents an object which has a {@link NamespacedKey} attached to it.
 */
public interface Keyed {

    /**
     * Return the namespaced identifier for this object.
     *
     * @return this object's key
     */
    NamespacedKey getKey();
}