What does PEM stand for?

• A. Photo-luminescent Emergency Markings.
• B. Portable Emergency Module
• C. Passenger Evacuation Map
• D. Public Emergency Manual

Answer: (A)

PEM refers to markings that glow to guide people to safety during an emergency. In aviation safety, signs and floor-path indicators are often made with photoluminescent material, which absorbs light in normal conditions and then emits it in darkness. This ensures exits and escape routes remain visible if the cabin lighting fails, helping passengers evacuate quickly and safely. The phrase Photo-luminescent Emergency Markings precisely describes those glow-in-the-dark indicators that point to exits and routes. The other options describe different objects or plans that don’t convey the idea of illuminated safety markings, so they don’t fit as well.