What are protective measures called that shield critical areas from potential foreign objects?

The term that best describes protective measures designed to shield critical areas from potential foreign objects is "Foreign Object Debris Barriers." This terminology directly relates to the specific purpose of these barriers, which is to prevent foreign objects, often referred to as debris, from entering sensitive zones, such as engine inlets or other critical operational areas in aviation and engineering contexts. These barriers are crucial because they help maintain operational safety by minimizing the risk of damage caused by objects that may inadvertently become airborne or dislodged in the vicinity of equipment.

While "Protective Barriers" and "Safety Covers" may imply some level of protection, they do not specifically capture the focus on foreign object debris. "Device Shields" also lack the specificity that highlights the concern for debris and the potential hazards it poses to delicate systems. Thus, "Foreign Object Debris Barriers" is the most accurate and contextually appropriate term in this scenario.