In ancient history, there were some weapons designed to function as tools, or to look like ordinary tools, so that they could be easily disguised or carried. Here are some examples: 1. **Cane Sword**: It looks like an ordinary walking cane, but a sword can be drawn from the inside. This design was quite popular in the Middle Ages and Victorian era. 2. **Pick**: It is not uncommon for farm tools to be used as weapons in Chinese and Japanese history. A hoe or sickle can be used as a weapon when necessary, and some are even designed specifically to be tools that can be used for both labor and defense. 3. **Hatchet**: As a tool used for chopping and mowing, the hatchet has also been used as a combat tool in some cultures. 4. **Rope or chain**: These are usually used as binding or pulling tools, but in martial arts, such as Japanese ninja or Chinese martial arts, they are skillfully used as weapons. 5. **Feather fan**: In China, feather fans are sometimes transformed into concealed weapons, capable of hiding needles or blades. These objects functioned as both tools and weapons in certain historical contexts, and sometimes might have been designed to conceal a weapon for defense or to surprise an opponent in combat.