Which of the following types of equipment is specifically known as personal protective equipment?

Personal protective equipment (PPE) is specifically designed to protect the individual from hazards that can cause injury or illness in the workplace. Hearing protection is included in this category because it is used to safeguard the hearing of workers in environments where noise levels are high enough to cause damage. PPE is generally worn directly by individuals and includes items like helmets, gloves, safety glasses, respiratory protection, and indeed, hearing protection devices such as earplugs or earmuffs.

The other options, while important to workplace safety, do not fall under the definition of personal protective equipment. Barriers serve as physical dividers or protections but are not worn by individuals. Emergency plans outline procedures for responding to emergencies but do not provide direct physical protection. Signage communicates hazards and safety information but does not provide personal protection. Therefore, hearing protection is the only option that directly fits the definition of personal protective equipment.