Final answer:
A pinch point in machine safety, as defined by 29 CFR 1910.211, is where two objects may come together, which could potentially cause injury to a person.
Step-by-step explanation:
According to 29 CFR 1910.211, a "pinch point" refers to Option 3: The point where two objects may come together, causing injury. In the context of machine safety, pinch points are areas where it is possible for a body part, clothing, or an accessory to get caught between moving parts of a machine, or between the moving and stationary parts of a machine, or between material and any part of a machine, during operation. Understanding where pinch points are on machinery is crucial for preventing workplace injuries. Proper guarding and safety procedures must be in place to protect workers from these hazardous areas.