What type of device is designed to initiate a fire alarm notification?

The device specifically designed to initiate a fire alarm notification is known as an initiating device. This category includes various types of sensors and manual pull stations that detect smoke, heat, or flames and signal the fire alarm system to alert occupants or authorities about a potential fire. Initiating devices are critical components in ensuring that a fire alarm system functions correctly, as they provide the initial detection required to commence the notification process.

While the fire alarm panel plays a significant role in processing signals from initiating devices and coordinating the overall fire alarm system, it does not directly initiate the alarm itself. Similarly, notification appliances are components like horns and strobes that provide audible and visual alerts to occupants once the alarm has been activated. The control panel acts as the central hub for managing the system but, again, does not engage in the actual initiation of the alarm. Therefore, identifying initiating devices as the correct answer is crucial for understanding their specific function in a fire alarm system.