When using simple items for self-defense in public, you need to make full use of your surroundings and follow local laws and regulations. Here are some common items that can be considered for defense: 1. **Keys**: Can be held in a fist as a makeshift stabbing tool. 2. **Pens or pencils**: Can be used to poke sensitive areas of the opponent, such as the eyes or throat. 3. **Hat**: Quickly throw it at the opponent's face to distract their attention and buy time to escape. 4. **Mobile phone**: Although not suitable as a direct attack tool, it can be used to call for help or record the incident. 5. **Bag or backpack**: Can be used to block attacks or as a shield. 6. **Umbrella**: Especially long-handled umbrellas, can be used to push or poke the opponent. 7. **Beverage bottles**: Whether plastic or glass bottles, they can be used as striking tools in emergency situations. 8. **Books or magazines**: Can be rolled up to increase hardness and used for attack or defense. When using these items, you should always prioritize self-protection and finding opportunities to escape. Try to avoid direct confrontation and seek help as soon as it is safe.