Which component is described as an appliance that can be seen, heard, or felt?

The term "Alarm Notification Appliance" refers to components of a fire alarm system that are designed to alert occupants of a building to the presence of a fire or emergency. These appliances can include devices such as bells, horns, strobes, and other audible or visual indicators that provide clear messages to individuals in the vicinity. The defining characteristic of an Alarm Notification Appliance is that it communicates through sensory means; it can be seen (like flashing lights), heard (like alarms or sirens), or even felt (in some cases where vibrations can signal alerts).

In the context of fire safety, effective communication is crucial for the protection of occupants, and this is accomplished through the use of these notification appliances. They ensure that everyone is aware of an emergency situation and can take appropriate action, such as evacuating the premises.

Central Stations, while important, are typically responsible for monitoring alarm signals and do not serve as direct notifications for individuals in the building. Alarm Signal refers more broadly to the signal that is sent out by the system but does not specifically define the appliances that communicate with the occupants. Alarm Circuit Testers are specialized tools used for testing the functionality and integrity of alarm circuits, but they do not provide notification in the way appliances do.