What does PSU stand for regarding passenger amenities in an aircraft?

The term PSU stands for Passenger Service Unit, which is the correct answer. This unit is an essential component of an aircraft's cabin design, providing various amenities and services to passengers during their flight. Typically, the PSU is located above the passenger seats and contains essential features such as reading lights, air supply controls, and sometimes additional components like oxygen masks in case of an emergency. By offering these amenities, the PSU helps enhance the overall passenger experience, ensuring comfort and safety while traveling. Other terms such as 'Passenger Support Unit' or 'Passenger Safety Unit' do represent various aspects of airline operations, but they are not standard terminology specifically related to the amenities provided to passengers in the aircraft cabin. Similarly, 'Passenger Satisfaction Unit' is not an established term used within aviation context.