What is a good way to prevent an injury or fatality from a propeller?

To prevent injuries or fatalities from a propeller, always ensure that the area around the propeller is clear of people and obstacles before starting the engine. Implement strict safety protocols, such as using "propeller danger" signs and maintaining a safe distance when the propeller is in motion. Additionally, educate all personnel on the dangers of propellers and the importance of following safety guidelines. Regular maintenance and checks on the equipment can also help prevent accidents.